How to "Bump Security String" ? - LineageOS Questions & Answers

Hey there, I hope that maybe someone could take the time to explain this process to me a bit.
I'm building LineageOS 15.1 for the Axon7. As there hardly are any updates, besides monthly Security Updates, I'm always just waiting for those to get merged. As hardly anyone is still interested in the 15.1 source this sometimes takes quite a while (not complaining).
I've had a look at the merged commits in the Lineage source and all I can see is that literately one string gets updated. The Date.
Now my question is. If I were to change that string in my local source, with the (as mentioned in the "version_defaults.mk") corresponding and matching date of the Android Security Patch Level , would that automatically sync all necessary patches and the security patch level of my ROM (if it builds)would be up to date?
Also does it have to be the exact date, or simply any date, after the Security Patch was commited?
Would that really be all it takes?
Thanks in advance to anyone, who might help me clear that up.

You can use repopick to build with patches not merged yet. Like...repo sync source build/envsetup.sh repopick -t n-asb-2020-04 breakfast...
July patches for oreo are merged
https://review.lineageos.org/q/topic:%22O_asb_2020-07%22
August patches are not yet in gerrit

Also erstmal danke für deine Antwort.
I'm really relatively new to building roms and I appreciate any and all info that I can get, so again, thanks you for that.
Is there, like I asked, any chance tho to build it with the latest security updates before they are added as "open" to the gerrit?
Can it be added the way I mentioned above, or is there more to it?

Related

[REFERENCE] [OOS/CUSTOM] OnePlus 5 kernel source with linux-stable (4.4.162)

Introduction
Hello everyone, this is a thread to introduce both users and kernel developers to the concept of linux-stable as well as give developers some tips and a tree to either merge into their own, use as a base, or just as a reference. Feel free to ask questions and enjoy!
What is it?
linux-stable is, as the name implies, the stable branch of the Linux kernel, the base of Android. The phone could not run without the Linux kernel (at least not without reworking a lot of stuff). The Android kernels are based on the longterm stable trees:
Longterm
There are usually several "longterm maintenance" kernel releases provided for the purposes of backporting bugfixes for older kernel trees. Only important bugfixes are applied to such kernels and they don't usually see very frequent releases, especially for older trees.
Click to expand...
Click to collapse
Source: https://www.kernel.org/category/releases.html
All Linux development happens on the master branch, which is governed by Linus Torvalds. When issues are discovered there, the fixes are applied then backported to these various stable trees for consumption. It is not uncommon for a fix to need to go back a few years.
There is a LOT more information available in the notes repo in the android-linux-stable organization if you care to learn more in-depth: https://github.com/android-linux-stable/notes
What does this mean for me?
If you are a developer, this means you should be merging these changes into your own tree. These are vetted, stable fixes to real world problems and they are being handed out for free. It does not take long to get up to date (as you can just merge this tree directly into your own or do it yourself using the tree as a reference) and once you are up to date, there is usually a release once every two weeks, give or take. I provide a rebuttal to a lot of various complaints here. If you still feel like there is a good reason not to do this, please let me know, I'll be happy to try and debate on it!
If you are a user, it means that you should be looking for and using kernels that have these fixes, as it shows the developers care for your security and stability. The current version for this device is 4.4.78 on OOS and 4.4.100 on Lineage while the current version upstream is 4.4.162 so all you need to do is go into Settings > About phone and look at the kernel version to know if you are up to date.
How do I use?
If you are a developer, the reference tree is located in the android-linux-stable organization: https://github.com/android-linux-stable/op5
There are three branches, one for OxygenOS 8.0 stable, one for OyxgenOS 8.1 beta, and one for Lineage 15.1.
This can either be merged into your existing kernel tree if you have one or be used as a fresh base. You do not need my permission to use it nor do you need to give me credit (although it would be appreciated).
If you are a user, use a kernel that has the changes added in!
Getting notified about updates
There are a few ways to get notified of linux-stable updates:
The linux-kernel-announce mailing list: http://vger.kernel.org/vger-lists.html#linux-kernel-announce
The android-linux-stable Telegram channel: https://t.me/alsupdates
Subscribe to this thread
Follow me on Google+ or Twitter
Getting help
If you have any issues with getting these changes into your tree or want to ask a question, there are a few different ways to do it:
Post in this thread
Join the linux-stable support chat on Telegram: https://t.me/joinchat/C1UAJ1EMSX31PCFdwLnOSg
File an issue either in the android-linux-stable notes repo or the android-linux-stable repo for this device
When requesting help, please give some solid details as to what you are struggling with, as I am happy to provide assistant and clarity but not to do something for you (unless I screwed up).
From what I understand, you're creating a space where you're updating the stock Kernel to the latest Linux tags and creating a clean base that others can develop upon for a consistently updated kernel?
Seems to me like the epitome of a community project and in keeping with the heart behind open source.
Great work Nathan!!!
Sent from my OnePlus 5 using XDA Labs
rav101 said:
From what I understand, you're creating a space where you're updating the stock Kernel to the latest Linux tags and creating a clean base that others can develop upon for a consistently updated kernel?
Seems to me like the epitome of a community project and in keeping with the heart behind open source.
Great work Nathan!!!
Sent from my OnePlus 5 using XDA Labs
Click to expand...
Click to collapse
Exactly correct I have seen others grab my kernel and base their work upon (which I have zero issues with) but I know most do it because I've merged linux-stable as one of my first things. Figured I would make their lives easier (plus doing the conflict resolution summaries helped me validate my own work). I am mulling over posting these to the mailing lists so other mainline Linux developers with these devices can easily test new builds and get the latest fixes without needing to do the work themselves (even if they are fully capable).
nathanchance said:
Exactly correct I have seen others grab my kernel and base their work upon (which I have zero issues with) but I know most do it because I've merged linux-stable as one of my first things. Figured I would make their lives easier (plus doing the conflict resolution summaries helped me validate my own work). I am mulling over posting these to the mailing lists so other mainline Linux developers with these devices can easily test new builds and get the latest fixes without needing to do the work themselves (even if they are fully capable).
Click to expand...
Click to collapse
If you're doing the work anyway and it's just a simple push to mailing list then might as well. Others can choose whether to use it or not but at least it's there. :good:
Sent from my OnePlus 5 using XDA Labs
where to download the link?
Gayrat1999 said:
where to download the link?
Click to expand...
Click to collapse
This isn't a kernel you flash, this is something for developers to use in their own work. For example, my kernel Flash already has all of this, which you can flash.
Nice. How about GCC error fixes and wifi stack driver in this base?
neobuddy89 said:
Nice. How about GCC error fixes and wifi stack driver in this base?
Click to expand...
Click to collapse
I toyed with the idea of doing two branches (one for building, one for usability) but decided against it as 1. I want this source to be as plain as possible and 2. It doesn't fully fit with the idea of this project. This purely to help developers get up and running with linux-stable, not a fully fledged custom kernel. I will consider adding the GCC fixes to the usability README though, that could be useful.
You are a true asset to this community!
4.4.103 has been merged in, with conflict notes updated accordingly.
Oh boy oh boy it might be time for a rebase for me
4.4.104 has been merged in, with conflict notes updated accordingly.
I truly apologize to anyone who was tracking the tree because I just force pushed. I decided to update the location and branch name and wanted everything to be consistent. It is now up to date with 4.4.105.
I have updated the OP with the notes and tree location. The new notes are on the staging branch right now, they will be merged into master once everything is finalized.
I'm sorry being out off topic, but can i use this https://github.com/android-linux-stable/msm-3.18 kernel source as base for my soc (msm8937) sir?
zainifame said:
I'm sorry being out off topic, but can i use this https://github.com/android-linux-stable/msm-3.18 kernel source as base for my soc (msm8937) sir?
Click to expand...
Click to collapse
Most likely yes. For the future, this thread is geared towards the generic CAF trees (msm-3.18 and msm-4.4). Feel free to ask me anything over there.
4.4.106 has been merged in (conflict notes).
4.4.107 has been merged in.
4.4.108 has been merged in.
4.4.109 has been merged in (conflict notes).
4.4.110 has been merged in (conflict notes).

[REFERENCE] Pixel 2 kernel source with linux-stable (4.4.162)

Introduction
Hello everyone, this is a thread to introduce both users and kernel developers to the concept of linux-stable as well as give developers some tips and a tree to either merge into their own, use as a base, or just as a reference. Feel free to ask questions and enjoy!
What is it?
linux-stable is, as the name implies, the stable branch of the Linux kernel, the base of Android. The phone could not run without the Linux kernel (at least not without reworking a lot of stuff). The Android kernels are based on the longterm stable trees:
Longterm
There are usually several "longterm maintenance" kernel releases provided for the purposes of backporting bugfixes for older kernel trees. Only important bugfixes are applied to such kernels and they don't usually see very frequent releases, especially for older trees.
Click to expand...
Click to collapse
Source: https://www.kernel.org/category/releases.html
All Linux development happens on the master branch, which is governed by Linus Torvalds. When issues are discovered there, the fixes are applied then backported to these various stable trees for consumption. It is not uncommon for a fix to need to go back a few years.
There is a LOT more information available in the notes repo in the android-linux-stable organization if you care to learn more in-depth: https://github.com/android-linux-stable/notes
What does this mean for me?
If you are a developer, this means you should be merging these changes into your own tree. These are vetted, stable fixes to real world problems and they are being handed out for free. It does not take long to get up to date (as you can just merge this tree directly into your own or do it yourself using the tree as a reference) and once you are up to date, there is usually a release once every two weeks, give or take. I provide a rebuttal to a lot of various complaints here. If you still feel like there is a good reason not to do this, please let me know, I'll be happy to try and debate on it!
If you are a user, it means that you should be looking for and using kernels that have these fixes, as it shows the developers care for your security and stability. The current version for this device is 4.4.116 and the current version upstream is 4.4.162 so all you need to do is go into Settings > About phone and look at the kernel version to know if you are up to date.
How do I use?
If you are a developer, the reference tree is located in the android-linux-stable organization: https://github.com/android-linux-stable/wahoo
This can either be merged into your existing kernel tree if you have one or be used as a fresh base. You do not need my permission to use it nor do you need to give me credit (although it would be appreciated).
If you are a user, use a kernel that has the changes added in!
Getting notified about updates
There are a few ways to get notified of linux-stable updates:
The linux-kernel-announce mailing list: http://vger.kernel.org/vger-lists.html#linux-kernel-announce
The android-linux-stable Telegram channel: https://t.me/alsupdates
Subscribe to this thread
Follow me on Google+ or Twitter
Getting help
If you have any issues with getting these changes into your tree or want to ask a question, there are a few different ways to do it:
Post in this thread
Join the linux-stable support chat on Telegram: https://t.me/joinchat/C1UAJ1EMSX31PCFdwLnOSg
File an issue either in the android-linux-stable notes repo or the android-linux-stable repo for this device
When requesting help, please give some solid details as to what you are struggling with, as I am happy to provide assistant and clarity but not to do something for you (unless I screwed up).
4.4.103 has been merged in.
This is my first Nexus / Pixel (VZW Galaxy Nexus I don't count), how soon does Google typically release the kernel source for the DP's? Only after the official software release?
I'm torn between stable + your kernel and DP + stock kernel.
Telperion said:
This is my first Nexus / Pixel (VZW Galaxy Nexus I don't count), how soon does Google typically release the kernel source for the DP's? Only after the official software release?
I'm torn between stable + your kernel and DP + stock kernel.
Click to expand...
Click to collapse
It depends. Longer DPs like the initial release of a new major number (7.0, 8.0, etc) typically get kernel source within a month of the new DP version dropping. Smaller DPs usually don't get source until release (7.1 is the only other small DP that has ever happened so not much history).
:good::good::good:
I dont mean to go too offtopic here, but does that apply to the android source codes too? I meam does it usualy take that long for them to release the sources? I am guessing we still dont have any custom roms because the sources were not released by google yet?
4.4.104 has been merged in, with conflict notes updated accordingly.
The repo location has changed (new link is in the OP).
Additionally, an 8.1 branch has been created. Google went from 4.4.56 to 4.4.88 so the branch was redone to avoid conflicts and go with Google's resolution. The notes have been updated as well. Happy kerneling!
4.4.106 has been merged in (conflict notes).
4.4.107 has been merged in.
4.4.108 has been merged in.
4.4.109 has been merged in (conflict notes).
4.4.110 has been merged in (conflict notes).
4.4.111 has been merged in.
Just as a heads up, I started school on Monday so while the updates will still continue, they may not be as timely as they have in the past, especially if there are conflicts that I need to document.
4.4.112 has been merged in (conflict notes).
I used this conflict in my video talking about thinking through linux-stable conflicts, check it out! https://www.youtube.com/watch?v=yWvU8_0O66A
4.4.113 has been merged in (conflict notes).
4.4.114 has been merged in.
4.4.115 has been merged in (conflict notes).
4.4.116 has been merged in.
The OP has been updated, including some more information for users as well as some more ways of getting help and notified of updates! Enjoy

[REFERENCE] Pixel 2 XL kernel source with linux-stable (4.4.162)

Introduction
Hello everyone, this is a thread to introduce both users and kernel developers to the concept of linux-stable as well as give developers some tips and a tree to either merge into their own, use as a base, or just as a reference. Feel free to ask questions and enjoy!
What is it?
linux-stable is, as the name implies, the stable branch of the Linux kernel, the base of Android. The phone could not run without the Linux kernel (at least not without reworking a lot of stuff). The Android kernels are based on the longterm stable trees:
Longterm
There are usually several "longterm maintenance" kernel releases provided for the purposes of backporting bugfixes for older kernel trees. Only important bugfixes are applied to such kernels and they don't usually see very frequent releases, especially for older trees.
Click to expand...
Click to collapse
Source: https://www.kernel.org/category/releases.html
All Linux development happens on the master branch, which is governed by Linus Torvalds. When issues are discovered there, the fixes are applied then backported to these various stable trees for consumption. It is not uncommon for a fix to need to go back a few years.
There is a LOT more information available in the notes repo in the android-linux-stable organization if you care to learn more in-depth: https://github.com/android-linux-stable/notes
What does this mean for me?
If you are a developer, this means you should be merging these changes into your own tree. These are vetted, stable fixes to real world problems and they are being handed out for free. It does not take long to get up to date (as you can just merge this tree directly into your own or do it yourself using the tree as a reference) and once you are up to date, there is usually a release once every two weeks, give or take. I provide a rebuttal to a lot of various complaints here. If you still feel like there is a good reason not to do this, please let me know, I'll be happy to try and debate on it!
If you are a user, it means that you should be looking for and using kernels that have these fixes, as it shows the developers care for your security and stability. The current version for this device is 4.4.116 and the current version upstream is 4.4.162 so all you need to do is go into Settings > About phone and look at the kernel version to know if you are up to date.
How do I use?
If you are a developer, the reference tree is located in the android-linux-stable organization: https://github.com/android-linux-stable/wahoo
This can either be merged into your existing kernel tree if you have one or be used as a fresh base. You do not need my permission to use it nor do you need to give me credit (although it would be appreciated).
If you are a user, use a kernel that has the changes added in!
Getting notified about updates
There are a few ways to get notified of linux-stable updates:
The linux-kernel-announce mailing list: http://vger.kernel.org/vger-lists.html#linux-kernel-announce
The android-linux-stable Telegram channel: https://t.me/alsupdates
Subscribe to this thread
Follow me on Google+ or Twitter
Getting help
If you have any issues with getting these changes into your tree or want to ask a question, there are a few different ways to do it:
Post in this thread
Join the linux-stable support chat on Telegram: https://t.me/joinchat/C1UAJ1EMSX31PCFdwLnOSg
File an issue either in the android-linux-stable notes repo or the android-linux-stable repo for this device
When requesting help, please give some solid details as to what you are struggling with, as I am happy to provide assistant and clarity but not to do something for you (unless I screwed up).
4.4.103 has been merged in.
4.4.104 has been merged in, with conflict notes updated accordingly.
The repo location has changed (new link is in the OP).
Additionally, an 8.1 branch has been created. Google went from 4.4.56 to 4.4.88 so the branch was redone to avoid conflicts and go with Google's resolution. The notes have been updated as well. Happy kerneling!
4.4.106 has been merged in (conflict notes).
4.4.107 has been merged in.
nathanchance said:
4.4.107 has been merged in.
Click to expand...
Click to collapse
What should we do without you nathanchance .. really appreciate your support
4.4.108 has been merged in.
nathanchance said:
4.4.108 has been merged in.
Click to expand...
Click to collapse
Really appreciate. Merry Christmas
Looking at this thread you are faster than google in update to latest linux-stable. Is google kernels so frankenstein or is there some sense in not using the latest security update?
Thaodan said:
Looking at this thread you are faster than google in update to latest linux-stable. Is google kernels so frankenstein or is there some sense in not using the latest security update?
Click to expand...
Click to collapse
Well Google has their own pipelines they have to go through to get these updates shipped, I don't. Google is about three months behind stable because they don't ship stable updates in their security updates (I think they should). So to be fair, three months ago, 4.4.88 was the latest.
Sent from my Pixel 2 XL using XDA Labs
4.4.109 has been merged in (conflict notes).
nathanchance said:
4.4.109 has been merged in (conflict notes).
Click to expand...
Click to collapse
Super ninja
4.4.110 has been merged in (conflict notes).
4.4.111 has been merged in.
Just as a heads up, I started school on Monday so while the updates will still continue, they may not be as timely as they have in the past, especially if there are conflicts that I need to document.
4.4.112 has been merged in (conflict notes).
I used this conflict in my video talking about thinking through linux-stable conflicts, check it out! https://www.youtube.com/watch?v=yWvU8_0O66A
4.4.113 has been merged in (conflict notes).
nathanchance said:
4.4.113 has been merged in (conflict notes).
Click to expand...
Click to collapse
Really appreciate your effort and help. Thank you so much. Do you mind to share your pre-build Clang 6.0 toolchain? I can't build with Clang 5.0 anymore. I had no issue with Clang 5.0 until 4.4.112. Seem 4.4.113 is broken with Clang 5.0. Thanks in advance
janjan said:
Really appreciate your effort and help. Thank you so much. Do you mind to share your pre-build Clang 6.0 toolchain? I can't build with Clang 5.0 anymore. I had no issue with Clang 5.0 until 4.4.112. Seem 4.4.113 is broken with Clang 5.0. Thanks in advance
Click to expand...
Click to collapse
You must have added something that broke Clang 5.0 then because I built with Clang 5.0 on the Essential Phone after merging in 4.4.113 without any issues.
But here, it's just Google's master branch: https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/
Sent from my Pixel 2 XL using XDA Labs
nathanchance said:
You must have added something that broke Clang 5.0 then because I built with Clang 5.0 on the Essential Phone after merging in 4.4.113 without any issues.
But here, it's just Google's master branch: https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/
Click to expand...
Click to collapse
Except Google removed the 6.0 toolchain :silly:
If anyone uses this, just run git revert HEAD

Has GN been abandoned by Lineage OS?

I cannot find GN on Lineage OS's download list any more.
LineageOS 13 has been removed from the build roster. As that was the only officially supported version on the GNex, that means the GNex no longer has any official builds, and the last one (20180211) has aged off the download server.
I don't know if anyone has it available somewhere else.
Try this: https://download.lineage.microg.org/maguro/
Just in case it's not obvious to everyone, that microg build is different to the official Lineage build. (I don't know, but I assume it simply takes the official build and adds microg stuff to it.)
The last official LineageOS 13.0 signed image for Galaxy Nexus Maguro
Does anyone have it? or have a link? That would be really great. Cant find it anywhere.
udusimus said:
Does anyone have it? or have a link? That would be really great. Cant find it anywhere.
Click to expand...
Click to collapse
I think this is mirror from official lineage downloads : https://androidfilehost.com/?fid=962187416754467700
And this is built by Android-Andi : https://androidfilehost.com/?fid=962187416754460076
Don't know differences, but both are little different in size by 100kb, there may be something different, you can give try to both..
I just checked the md5 displayed at that first link against the file I downloaded from LOS in February, and it matches. The hashes I got here are:
md5 - A049F70667D018F814B84D221B844C97
sha1 - B98E1760CE063E2C64C07BAAE33AB4DBECB5823B
sha256 - AF4F3E07DF677AA5BF4E2D6D9CB8AF3F410029344ACC099DCD8589F39778D115
Does anybody know if general security fixes are being applied to the Lineage OS 13 branch at all any more? No point in rolling your own if the patch level isn't being kept up to date.
dumas777 said:
Does anybody know if general security fixes are being applied to the Lineage OS 13 branch at all any more? No point in rolling your own if the patch level isn't being kept up to date.
Click to expand...
Click to collapse
LOS's Changelog 16 says "The branches will not be locked, so it’ll still be open for contributions such as security patches, like the 11.0 branch which has been getting security patches backported from the community."
I have no idea whether anybody is actually doing it, though.
Yes, development of LIneage13 is still continue : https://review.lineageos.org/#/q/branch:cm-13.0
Good deal. Thanks for the info from both of you. Looking forward to building it myself and here when it finishes in a week (only slight exaggeration) I will be gold lol.
There is an unofficial Lineage OS 14.1 build floating around on XDA somewhere. I have it installed on a Galaxy Nexus and it's not bad, a little slow at times but I also installed the pico open gapps package as well.
Found the link: https://forum.xda-developers.com/galaxy-nexus/development/dev-lineageos-14-1-t3649194

[UNOFFICIAL]LineageOS 15.1 For Nexus 9 (WIFI) (Feb 24, 2022)

BEFORE YOU decide to try this rom, please read all of post 1, 2 and 3.
I am not responsible for lost data, identity theft, lost money, security vulnerabilities, bricked devices or any other hardware or software malfunctions that comes as a result of flashing this ROM.
BACKUP YOUR DATA AND OLD ROM BEFORE trying this rom.
What works
I only test what I use. There could be other things that work or don't work. Let me be clear since there are people who don't seem to understand this. I cannot test things that I don't have like paid streaming/gaming, NFC, miracast or apps that I don't use. They may work or they may not work.
If you want to know if something works that's not listed here, then you need to try it for yourself. If that's not an acceptable or reasonable answer, then stop reading and find another rom that meets your requirements. I built this rom for myself to use and thought that some in the community might benefit by sharing it. If this rom doesn't meet your requirements, then delete it and use whatever does.
1. audio over bluetooth
2. wifi
3. brightness
4. external audio
5. GPS - a bit slow to get a fix/lock
6. audio through headphone jack
7. camera
What doesn't work
1. screen recorder. The current sepolicy doesn't allow screen recorder to work. While adding code to allow sepolicy to work
Code:
#============= mediacodec ==============
allow mediacodec camera_device:chr_file { ioctl open read write };
The [email protected] crashes. A mp4 file is created, but it doesn't seem to be in the correct format? Possibly related to ??
https://review.lineageos.org/c/LineageOS/android_device_htc_flounder/+/210609
FAQ
Q1) Does the build work on Nexus 9 LTE?
A1) I have no idea. I only have the Nexus 9 wifi so I don't know if it will work on LTE. If you have the LTE, you can build your own LTE rom. If you try the wifi build on the LTE, you may end up with a bricked device. Questions regarding LTE will go unanswered.
Q2) Application xyz doesnt' work. Can you fix it?
A2) I only fix what I use. If you use app xyz and it doesn't work, then try 14.1 or going back to the last rom that worked for you. In addition, some of the code is not open source and in proprietary blob format so it's not possible to make changes.
Q3) My tablet hangs or crashes with 15.1. This build is slow and buggy. Can you fix it?
A3) Go back to the last working stable rom for you. 15.1 is a work in progress and will have bugs and frequent changes. In addition, some of the code is not open source and in proprietary blob format so it's not possible to make changes.
Q4) Do you plan to update the rom?
A4) Yes as long as I have high speed Internet, I wil try to release the rom monthly to incorporate the security patches.
Q5) What TWRP should I use?
A6) TWRP 3.3.1 or higher. Get it from
Download TWRP for flounder
Download TWRP Open Recovery for flounder
dl.twrp.me
Q6) What is the difference between this rom and variants?
A6) Use whatever fits your needs. This is a stock LineageOS build with no modifications. I only offer this as an option for those who want or need a new rom and can't build it themselves.
Q7) Will there be a 16.0, 17.1 or 18.1 build?
A7) I tried building 16.0, but the rom get's stuck at the very begining of the boot process and I haven't investigated too much. Do not ask if there is progress on this. I'm an unpaid volunteer building this on my own time. Any questions regarding ETAs will go unanswered.
I suspect that one or two LineageOS developers have a working 16.0 build, but they are not ready to share their code? The repos have been updated to 16.0 at
LineageOS
A free and open-source operating system for various devices, based on the Android mobile platform. This is a mirror of https://review.lineageos.org/ - LineageOS
github.com
on Nov 4, 2020.
If you are a rom builder or developer and want to help get 16.0 going, please contact me.
Q8) Should I upgrade from stock or 14.1 to 15.1?
A8) It's entirely up to you. If you do upgrade, you will need to backup your data, wipe dalvik/art cache, system, data and internal storage in TWRP. You must also format data in TWRP. You cannot dirty flash from stock or 14.1 to 15.1, it must be a completely clean fresh install.
Q9) Can I build this rom myself? Where can I find the source and/or kernel source code?
A9) This is one of the few roms where it required no edits or changes to make it work. Follow the instructions at
Flounder
Build for flounder | LineageOS Wiki
wiki.lineageos.org
Flounder_lte
Build for flounder_lte | LineageOS Wiki
wiki.lineageos.org
and you will get a working 15.1 image. You will need to apply (hw video patch)
https://review.lineageos.org/268654
The roomservice.xml only consists of 3 repos. The roomservice.xml points to all the source code including the kernel source code. That is,
GitHub - LineageOS/android_kernel_htc_flounder
Contribute to LineageOS/android_kernel_htc_flounder development by creating an account on GitHub.
github.com
GitHub - LineageOS/android_device_htc_flounder
Contribute to LineageOS/android_device_htc_flounder development by creating an account on GitHub.
github.com
GitHub - TheMuppets/proprietary_vendor_htc
Contribute to TheMuppets/proprietary_vendor_htc development by creating an account on GitHub.
github.com
Code:
<?xml version="1.0" encoding="UTF-8"?>
<manifest>
<project name="LineageOS/android_device_htc_flounder" path="device/htc/flounder" remote="github" revision="lineage-15.1" />
<project name="LineageOS/android_kernel_htc_flounder" path="kernel/htc/flounder" remote="github" revision="lineage-15.1" />
<project name="TheMuppets/proprietary_vendor_htc" path="vendor/htc" remote="github" revision="lineage-15.1" />
</manifest>
I changed the fstab.flounder from forceencrypt to encryptable.
Code:
/dev/block/platform/sdhci-tegra.3/by-name/UDA /data f2fs noatime,nosuid,nodev,errors=panic wait,check,latemount,encryptable=/dev/block/platform/sdhci-tegra.3/by-name/MD1
/dev/block/platform/sdhci-tegra.3/by-name/UDA /data ext4 noatime,nosuid,nodev,nomblk_io_submit,errors=panic wait,check,latemount,encryptable=/dev/block/platform/sdhci-tegra.3/by-name/MD1
Normally, monthly builds go smoothly, but every once in a while, the monthly changes break something. This happened with the Nexus 9 for the May 5 security patches. While compiling, it was giving
"SSL error when connecting to the Jack server."
After some dead ends and research, I found
Rebuild android code with error “SSL error when connecting to the Jack server. Try 'jack-diagnose”
System: ubuntu 18.04 environment:VirtualBox The first time I compiled the AOSP source code on Ubuntu 18.04, it passed, and the second time I compiled it failed. Here is an error message. [ 10% 538/...
stackoverflow.com
To fix this, you need to "Remove TLSv1, TLSv1.1 from jdk.tls.disabledAlgorithms in /etc/java-8-openjdk/security/java.security" file.
Q10) Why is my question not answered?
A10) It's likely because it's in the FAQ or it's off topic or you are asking something that I cannot answer for the reasons stated in this FAQ.
Q11) How is this 15.1 build different from the ones already on XDA?
A11) The 15.1 roms built before Nov 4, 2020 didn't include this patch
flounder: Patch libraries that rely on arm libm intrinsics · LineageOS/[email protected]
* Force-pick https://review.lineageos.org/268655, build "libm" target, rename "libm.so" to "libw.so", and then: `sed -i 's/libm.so/libw.so/g' libw.so...
github.com
Also, some of the 15.1 roms may not have included the hw video patch. It's not part of the repository and requires the builder to pick and apply that patch manually.
For some, depending on how the device is used, having the hw video patch isn't necessary and will work fine without it.
Q12) Is the video hardware accelerated in 15.1?
A12) Yes. The March 9, 2021 and all future builds include this patch
https://review.lineageos.org/268654
for video hardware acceleration.
Q13) Is encryption enabled by default?
A13) Some people say the Nexus 9 lags over time and supposedly removing encryption improves performance. The Nexus 9 is not a daily driver for me so I don't know, but reading the older 14.1 and 15.1 threads, I decided to change the default behavior starting with the March 13, 2021 build so that encryption is disabled by default.
If you want encryption enabled, goto settings, security and privacy, encryption and credentials, encrypt tablet and follow instructions.
Q14) Can you build a variant like slimrom, crDroid, etc?
A14) No, but you can following the instructions and source code above that has been provided.
Q15) What gapps should I use?
A15) I personally am moving away from all google apps and technology. If you must use gapps, pick the smallest one which is pico ARM64.
Q16) Where can I download this rom?
A16) See
retiredtab - Browse /Nexus 9/15.1 at SourceForge.net
sourceforge.net
Feb 24, 2022 release notes
1. Incorporates UNOFFICIAL Feb 5 security patches as per https://review.lineageos.org/q/topic:O_asb_2022-02
2. Whatever LineageOS changed since Jan 5, 2022 (about 2,900 files had to be recompiled).
Jan 28, 2022 release notes
1. Incorporates Jan 5 security patches as per https://review.lineageos.org/q/topic:O_asb_2022-01
2. Whatever LineageOS changed since Dec 2021 (about 1,200 files had to be recompiled).
Dec 9, 2021 release notes
1. Incorporates Nov 5 and Dec 5 security patches as per https://review.lineageos.org/q/topic:P_asb_2021-11 and https://review.lineageos.org/q/topic:n-asb-2021-12. Specifically
Nov 5th
Code:
https://review.lineageos.org/c/LineageOS/android_frameworks_base/+/318648
https://review.lineageos.org/c/LineageOS/android_frameworks_base/+/318649
https://review.lineageos.org/c/LineageOS/android_frameworks_base/+/318650
https://review.lineageos.org/c/LineageOS/android_frameworks_base/+/318651
https://review.lineageos.org/c/LineageOS/android_packages_apps_Contacts/+/318654
https://review.lineageos.org/c/LineageOS/android_packages_apps_Settings/+/318655
https://review.lineageos.org/c/LineageOS/android_build/+/318658
Dec 5th
Code:
https://review.lineageos.org/c/LineageOS/android_external_tremolo/+/319986
https://review.lineageos.org/c/LineageOS/android_frameworks_av/+/319987 --> slight problem merging due to 14.1 and 15.1 code differences
https://review.lineageos.org/c/LineageOS/android_frameworks_base/+/319988
https://review.lineageos.org/c/LineageOS/android_packages_apps_Contacts/+/319989
https://review.lineageos.org/c/LineageOS/android_packages_apps_KeyChain/+/319990
https://review.lineageos.org/c/LineageOS/android_packages_apps_Settings/+/319991
2. Whatever LineageOS changed since Oct 2021 (about 4,300 files had to be recompiled).
3. This build is based on "stock" and not using Andrea's repos as it was reported to cause some slowness in operation.
Oct 11, 2021 release notes
1. Incorporates Oct 5 security patches as per https://review.lineageos.org/c/LineageOS/android_build/+/317622
2. Whatever LineageOS changed since September 2021 (about 2,400 files had to be recompiled).
3. This build is based on "stock" and not using Andrea's repos as it was reported to cause some slowness in operation.
Sept 24, 2021 release notes
1. Incorporates Sept 5 security patches as per https://review.lineageos.org/c/LineageOS/android_build/+/316179
2. Whatever LineageOS changed since August 2021 (about 1,800 files had to be recompiled).
3. This build is based on "stock" and not using Andrea's repos as it was reported to cause some slowness in operation.
Aug 9, 2021 release notes
1. Incorporates Aug 5 security patches as per https://review.lineageos.org/c/LineageOS/android_build/+/314577
2. Whatever LineageOS changed since July 2021.
3. This is the second build using Andrea's repos.
July 18 release notes
1. First build to incorporate changes by Andrea.
2. Incorporates July 5 security patches as per https://review.lineageos.org/c/LineageOS/android_build/+/313627
3. Whatever LineageOS changed since June 2021.
June 13, 2021 release notes
1. Incorporates June 5 security patches as per https://review.lineageos.org/c/LineageOS/android_build/+/312243
2. Whatever LineageOS changed since May 2021.
May 11, 2021 release notes
1. Incorporates May 5 security patches as per https://review.lineageos.org/c/LineageOS/android_build/+/309566
2. Whatever LineageOS changed since April 2021.
April 15, 2021 release notes
1. Incorporates April 5 security patches as per https://review.lineageos.org/c/LineageOS/android_build/+/307722
2. Removed livedisplay option from menu as it doesn't work on Nexus 9 Tegra SoC according to those more knowledgeable and experienced than I.
3. I recommend that you wipe cache/dalvik after you flash new build. Supposedly, the Nexus 9 internal flash file system gets slower over time and that wiping the flash and keeping as much free space available helps avoid the slowdown.
Release notes for March 13, 2021
1. Changed encryption to be disabled by default.
Release notes for March 9, 2021
1. Initial build for 15.1 Nexus 9 wifi only.
2. March 5, 2021 security patches
3. Built from LineageOS 15.1 repos with no changes or edits and includes the hw video patch.
4. Please be patient on first bootup.
For those that downloaded the March 8 build, please delete it. While it works, there was a problem with the build missing a hw video patch that I didn't notice at first. I will upload a March 9 build. Sorry for the trouble.
Reserved
For those that downloaded the March 8 build, please delete it. While it works, there was a problem with the build missing a hw video patch that I didn't notice at first. When I did a clean repo sync, I forgot to apply the hw video patch at
https://review.lineageos.org/268655
in the March 8 build. The March 8 build works as I tested it, but it wasn't until a few hours later that I realized I forgot to reapply the hw video patch.
The March 9 build includes the above hw patch. Sorry for the inconvenience.
I did notice a weird behaviour of voice match (the "ok google" service)
It keeps trying to update the voice model, shows a notification, then goes away for a bit.
Opening the voice match settings on google settings causes flickering on the window, as if it fails and restarts repeatedly. It also failed to initialize during the first boot, so I skipped it.
All other google apps seem to work fine. I've tried both Micro and Stock Gapps
AgentCain said:
I did notice a weird behaviour of voice match (the "ok google" service)
It keeps trying to update the voice model, shows a notification, then goes away for a bit.
Opening the voice match settings on google settings causes flickering on the window, as if it fails and restarts repeatedly. It also failed to initialize during the first boot, so I skipped it.
All other google apps seem to work fine. I've tried both Micro and Stock Gapps
Click to expand...
Click to collapse
Me too
I don't use or load gapps and I never use ok google. I'm degoogling everything in 2021.
New build lineage-15.1-20210313-UNOFFICIAL-flounder.zip has force encryption disabled by default.
Some people say the Nexus 9 lags over time and supposedly removing encryption improves performance. The Nexus 9 is not a daily driver for me so I don't know, but reading the older 14.1 and 15.1 threads, I decided to change the default behavior.
Since 15.1 will never be official, I changed the fstab.flounder from forceencrypt to encryptable.
Code:
/dev/block/platform/sdhci-tegra.3/by-name/UDA /data f2fs noatime,nosuid,nodev,errors=panic wait,check,latemount,encryptable=/dev/block/platform/sdhci-tegra.3/by-name/MD1
/dev/block/platform/sdhci-tegra.3/by-name/UDA /data ext4 noatime,nosuid,nodev,nomblk_io_submit,errors=panic wait,check,latemount,encryptable=/dev/block/platform/sdhci-tegra.3/by-name/MD1
If you want encryption enabled, goto settings, security and privacy, encryption and credentials, encrypt tablet and follow instructions.
If you want encryption disabled, backup all your data, goto TWRP, wipe dalvik/art cache, system, data and internal storage in TWRP. You must also format data in TWRP. Then install the March 13 build and encryption will be disabled by default. You can also change the cache and data to f2fs if you want for potentially better performance.
Going forward, all monthly security builds will have encryption disabled unless you enable it.
PS. That's the only change from the March 9 build. The above has been added to the FAQ now.
bought a nexus9 yesterday, went the noob path (outdated toolkit to unlock bootloader/ root+twrp... updated twrp to 3.5.9.0) then flashed your current rom... (9march) feel smooth and nice!
thanks for continuing working on this device! its a real upgrade from my previous tab (8" tab 3).. we cant all spend money on fancy device, nexus9 is still relevant today with this nice custom rom!
edit2: stupid me of course... now build 2021.03.13 is working well without encryption problem! (was trying to remove encryption following your tutorial with the previous rom)
I think there is a problem with accout registration. Ok google not working but it's impossible to register some account. I try microsoft one for word. It say internet connection is not present. Maybe this can help to solve the problem
Wow! Thanks for this! Since the new XDA update, it has been so awful I stopped using it. I just popped back on after 2 months away from XDA and found this rom! Going to try it soon.
One problem I had was with stadia not working. I don't mean to ask if it does now, but it does seem that the chrome browser version works now (vatrom's version). Can you at least take an educated guess if the new hardware acceleration patch in the repo might help get stadia working properly? I suspected it was either an unsupported codec or an issue with hardware acceleration being the culprit. Thanks
gk1984 said:
One problem I had was with stadia not working.
Click to expand...
Click to collapse
Never heard of stadia and I don't use google chrome browser.
Google Stadia is Google's cloud gaming platform. And no, I didn't ask about Chrome. I simply was trying to ask some clarity about Lineage's hardware acceleration patch vs Barron's, but included context to my situation. I clear8 stated I wasn't exactly asking if Stadia was working, but if the new hardware acceleration patch could impact it and why.
It's pretty unprofessional to blanket statement "I don't use x" and ignore the question. It also hurts your credibility as a developer if you can't explain what's being parched into the code if you directly mention it in the OP. You could simply respond with "I'm not an experienced developer and can't articulate X or Y, I'm just capable of building from source and distributing." We don't know you, we don't know your skill level or knowledge. I'm used to ROM developers or at least those building them to know what they're working on. But your. Blanket statement suggests otherwise.
back again.. and it fixed now! of course, i've downloaded the 20210309 build and couldnt figure a proper way to remove encryption on data partition... I've managed to flash gapps (use an old 16go usb key with microusb connector)..and come back to read CORRECTLY your post and understood my mistake... it was an old build!
Did a clean flash and flashed 0313 build, no more encryped data now! (flashed some nano gapps + magisk) setting up the device, so far so good!
It's great to see some people still have this tablet! They are under $50 used now, but it's a shame about stock performance...
Just some personal screenshoot...
AgentCain said:
I did notice a weird behaviour of voice match (the "ok google" service)
It keeps trying to update the voice model, shows a notification, then goes away for a bit.
Opening the voice match settings on google settings causes flickering on the window, as if it fails and restarts repeatedly. It also failed to initialize during the first boot, so I skipped it.
All other google apps seem to work fine. I've tried both Micro and Stock Gapps
Click to expand...
Click to collapse
I found a solution. Install the Google app from ApkMirror.com and restart the tablet. Should work after that. Looks like it's a common problem with open gapps I. General.
Hey thanks for sharing your rom
Can I dirty flash this rom from the other lineage os 15.1 build?
I'm not the developer, but I wouldn't recommend it. That usually leads to Android being unable to boot. Best to factory reset.
gk1984 said:
I found a solution. Install the Google app from ApkMirror.com and restart the tablet. Should work after that. Looks like it's a common problem with open gapps I. General.
Click to expand...
Click to collapse
Thanks it work for me

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