[EOL][KERNEL] [OnePlus2] [Lineage14/CM13] Boeffla-Kernel (27-03-2018)

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Apr 22, 2008
Hi all,

the day has come. Today is the day where I will drop support for the OnePlus 2 by providing a last, final LineageOS 14.1 kernel.
LineageOS 14.1 has meanwhile be replaced by LineageOS 15, which I am not gonna support anymore for known reasons.
I provided my first kernel on 03. Oct 2015, so I provided a solid support for the device for around 2.5 years, that's not too bad I would say.

I will leave the thread open for a few more weeks before I finally lock it.

Here we go for the last OnePlus 2 kernel (drum roll):

This kernel is end-of-life and marks the end of my support for LineageOS on the OnePlus 2.
There will be no LineageOS 15 kernel anymore. The journey is over.

Version 6.1 Stable Final
  • Important: Last and final kernel version after LineageOS 14.1 is officially closed now
  • Change: Ext4 tweaks and dynamic fsync are disabled be default
  • Change: Build script enhancements
For the ones that face some issues with charging, I also added a version with older charging drivers to the download folder (as I did for the last OOS kernel). Some prefer this version as it solves their slow charging problems.

CU again somewhere else in future, I still have newer phones in active maintenance, maybe you can get one of that models.

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    ** Note: This kernel is end-of-life and will no more be maintained. There will be no LineageOS 15.1 or newer kernel be available anymore **

    Hi all,

    some of you know me from the other OnePlus (One and X) or Samsung devices areas, where I provide my kernels already for more than two years to OnePlus One, OnePlus Two, Galaxy S5, S3 and Note 10.1 users for all sort of platforms (Samsung, LineageOS, Cyanogenmod, Omnirom etc.)

    Please note:
    I am not heading to have as many features as possible implemented, this is not my design goal. If you are more into that, move on to other kernels. If you are searching for a good mix of improvements and new functions while not sacrificing stability, you are welcome here (see below the history section for more info).

    Important notes

    When using new anykernel concept Boeffla-Kernel: Flash stock kernel of rom first !

    Make sure you flash the correct kernel version, depending on whether you really use LineageOS/CM or a different OS !!!

    Also note: You have to use Boeffla-Config app which I provide on my homepage to tweak the kernel. 3rd party apps will not be able to unleash the full power of the kernel.


    Important: This kernel is only meant to be compatible with official LineageOS and nothing else.
    It is reported to NOT work fine specifically on Resurrection Remix roms, also some Seraph based roms are not compatible.

    So when the kernel does not run on custom rom XYZ, do not even bother me with it or ask hundred times in the thread for compatibility.
    I could not care less about it !!


    First read the FAQ section on the Homepage !!!

    Click here to learn about all possible kernel settings in the config app (quite outdated, as it is focused on S3 still).
    Click here to learn about using the config app (quite outdated, as it is focused on S3 still).

    I will refuse to give support if you do any undervolting and experience freezes or hot reboots.

    I will also not provide any support if you do not use Boeffla-Config app to tweak the kernel, other 3rd party tweaking apps are known (and intended) to cause issues.

    I will refuse to give support if you have xposed framework installed and reporting any kind of weird issues. My opinion to xposed it quite clear: too powerful for >90% of the users that just mess up their system with it.

    Otherwise, you can get in touch with me via the support e-mail address: [email protected]

    Please provide kernel version, rom version, a detailed issue description and ideally supporting screenshots or log files.

    Change logs

    (you can also access them directly in Boeffla-Config V2 by pressing menu and selecting "change log...")

    Change log for LineageOS 14 kernel - Click here
    Change log for CM13 kernel - Click here


    • Support of anykernel concept (only latest kernels) - flash stock kernel before flashing Boeffla
    • Full integration with Boeffla-Config V2 (you need at least version 2.4.50 or higher !!!) configuration app (get it from http://www.boeffla.de) to configure all kernel settings
    • The two CPUs (big and little cpu) can be configured completely separate in terms of min/max frequencies, governors and hotplug profiles
    • Additional governors: Impulse, zzmoove, elementalx, conservative, ondemand
    • Additional schedulers: fiops, bfq, sio und zen
    • Hotplugging done by using stock core_ctl method
    • Many Hotplug tweak profiles (default are: little CPU always runs on 4 cores, big CPU runs on between 2 and 4 cores based on load)
    • Notification LED control (fading, speed, brightness)
    • Boeffla-Sound engine (Headphones volume configurable only)
    • Dynamic FSync (activated if screen on, deactived if screen off), configurable
    • Input boost frequencies and duration configurable, input boost switch
    • No CPU and GPU overclocking (also not planned)
    • No CPU and GPU voltage interface (also not planned)
    • GPU underclocking to 27 MHz possible
    • GPU boost implemented (4 levels)
    • msm_adreno_tz and simple_ondemand tweaked to better utilize low frequencies
    • Show CPU frequency usage per CPU and frequency in Boeffla-Config
    • Show GPU frequency usage per frequency in Boeffla-Config
    • KCal V2 Color control
    • Display backlight limits configurable (to avoid display brightness gets too low in some situations)
    • Display backlight dimmer
    • Swipe2wake gestures
    • Swipe2sleep gestures
    • Boeffla generic wakelock blocker V1.1.0 (documentation)
    • BCL (battery current limit) driver switchable (default is on)
    • SD card read ahead buffer configurable (default increased to 1024 kB)
    • Ext4 File system tweaks (default to on, can be disabled)
    • Thermal engine profiles (in system Tweaks section)
    • Kernel logger (dmesg) configurable
    • Boeffla charge analysis (display of charger type and charge current in Boeffla-Config app in real time)
    • USB charge rate bumped up to 900 mA
    • CIFS support (module, do not mount inside /data, if you rooted with Chainfire SuperSu, make sure you uncheck the namespace separation in SuperSu app)
    • NFS support (module)
    • NTFS support (module)
    • XBox support (module)
    • OTG-Ethernet support (module)
    • TCP Congestion changed to Westwood
    • Many additional TCP congestion algorithms activated to be used
    • Entropy values configurable
    • Hardware touch keys locked as long as screen is in use (touched) for better usability (default, but configurable)
    • init.d support (in /system/etc/init.d - set correct permissions!)
    • Automatic EFS backup
    • Integrated full busybox 1.27.2 (own compilation)
    • Safetynet: verifiedbootstate + additional flags removed
    • Kernel initialisation log file (with history of 3 log files)
    • Emergency reset script automatically placed into /boeffla-kernel-data folder of your internal memory
    • Rom flash survival mode configurable in Boeffla-Config
    • Google gcc 4.9 toolchain (64 bit) used for best stability
    • Always using latest CM13 Initramfs
    • Always based on latest CM13 kernel sources (http://github.com/CyanogenMod/android_kernel_oneplus_msm8994)


    For all information and downloads (stable AND testing versions), visit the Boeffla-Kernel homepage:

    History and design targets

    Basically I created my first Boeffla-Kernel in 2012 as there was no kernel for the Samsung Galaxy S3 around that had exactly the mix of functionalities that I wanted. I wanted to have full flexibility in undervolting and charge rates for instance, but did not like the sharpness and/or brightness tweaks many kernels have implemented as per default.

    Hence, I began to create my own kernel after a while, adding all the features I like. This is the result of my work, which in the end I decided to share with you. I hope you like it as much as I do.

    The objective of this kernel is to have a kernel for daily use. It does not aim for best battery life, or best smoothness or best benchmark scores. Also it does not aim to have the broadest feature set available everywhere.
    It aims more for a good mix of all, not sacrificing stability and functionality in the end.
    And - most important: It aims to stay quite close to stock !!!

    These design targets are also valid for the OnePlus kernel here!!!

    This said, I will definitely NEVER implement:

    • things I do personally not need
    • things I do not like
    • things that are in any way dangerous
    • anything which is highly experimental
    • f2fs - it is known to cause various issues and compatibility problems
    • custom hotplugging algorithms
    • a CAF based kernel
    • anything that requires upstreaming of kernel parts to a higher kernel major version
    So do not even ask for it if it falls into the listed categories. Everything else I am happy to check and decide.

    And: I do not really care about benchmark numbers, they say almost nothing as long as something is not completely wrong. Important for me is the feel-good factor.
    I am also not interested in gaming at all, so never expect a gamer kernel. It will just not happen...


    To reiterate it again: Flash the correct kernel depending on whether you are using LineageOS/CM or another rom !!!

    Configuration of the kernel

    To tweak and configure the kernel, manually load and install the app "Boeffla-Config V2" from the downloads section on www.boeffla.de.

    You need at least version 2.4.50 or higher for the OnePlus 2 Boeffla Kernels.


    If you like my work, feel free to donate: Donation-Link

    If you donate at least 2,49 EUR (to be in line with the donation app prices on Google Play store), you will receive a personal donation code which unlocks some nice little comfort functions in Boeffla-Config V2 on top.

    Source code

    All sources can be found in my Github repository: http://github.com/andip71

    Credits to developers

    Of course, I had never been able to create all that by my own. So I want to give credits to the really good developers around, that have given me all the inspiration and from which I cherry picked lots of the implemented functionalities:

    * ZaneZam
    * flar2
    * Grarak
    * Yank555
    * Hardcore
    * Chainfire
    * AndreiLux
    * Netarchy
    * Gokhanmoral
    * Simone201
    * Mialwe
    * Entropy512
    * Faux
    * Harunjo
    * FranciscoFranco
    * Ak

    ... I just hope I did not forget someone. If so, please let me know and I will add you of course.
    Thanks to all of you for your great work !!!


    *** As always - Flash on our own risk! ***

    Make sure you flash the correct version depending on your firmware version!

    I can and will not take any responsibility for bricked phones or lost data.

    It is generally recommended to run a complete Nandroid backup in your custom recovery and safely store your personal data before you flash a new kernel.

    Cheers and enjoy
    Hi all,

    new things are coming up soon, I will change the complete concept of Boeffla-Kernel during start phase very soon (yes, I will move on to anykernel method).

    Hence, I release my kernels now as last stable releases following still the old concept (static ramdisk method).

    Version 5.0 stable

    • Note: This is the last version of this Boeffla-Kernel which comes with a static ramfisk.
      New kernel versions will work with a completely new concept (anykernel method).
    • Note: Only use this version on official CM13 nightlies
    • Note: You need at least version 2.2.51 of Boeffla-Config V2 to allow all functionalities to be available
    • Fix: Big CPU cluster hotplugging profile "min=2, max=4 (default)" fixed to not switch off cores when certain apps (i.e. camera) are started
    • Update: Ramdisk of official CM13.0 build of 04.07.16
    Anykernel arrived

    Hi all,

    it is time for the first CM13 kernel with the new anykernel concept.

    Before you start, make sure you have read and understood the following:

    If you ask questions which are addressed in this article, or you have issues which are a consequence of not reading the article, I will not answer. It is your responsibility to understand what you do BEFORE you do it.

    (and also read this for more background: http://boeffla-kernel.de/index.php/6...ernels-new-app)

    Side note:
    Although the kernel is now likely to be much more compatible with custom roms using CM basis, I will not change my support conditions at all. If you report an issue on a non-original CM rom, do not expect me to react (http://boeffla-kernel.de/index.php/support/support)

    Ensure you update to latest Boeffla-Config App 2.3.1 BEFORE you flash the new kernel !!!

    Enough threatening now, here we go:

    Version 5.1-beta1

    • Note: This is the first Boeffla-Kernel with the new anykernel concept.
      Make sure you read and understand the basics: Boeffla-Anykernel Know-How and New concept kernels/New app

    • Note: You have to use Boeffla-Config version 2.3.1 or newer in order to use all functionality !!
    • This kernel as exactly the same functionalities as the last stable kernel release
    Hi all,

    small update to CM14.1 Boeffla-Kernel is out.

    Version 6.0-beta7

    • Change: Support for extended slider functions on certain custom roms
    • Fix: Rare CPU scaling issues fixed

    P.S. Thread remains closed.
    Looking good so far...

    Hi all,

    I might release beta1 for official CM13 still today.

    So far testing is looking good.

    Screenshot attached.