[imoseyon (OP)]

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Mod Type: Kernel	Difficulty: Very Easy	Mod Status: Stable	Mod Base: AOSP	Carrier: Unlocked GSM
Requires Root: Yes	Apply In: CWM Recovery	Optional: Overclocked	Optional:	Android Version: 4.0.3 (ICS)

This is a minimalistic Galaxy Nexus kernel. My philosophy is to keep the kernel as lean and stable as possible, at the same time to keep the kernel as modern and close to latest mainstream linux as possible. You will see that my kernels will lack a lot of the bells and whistles from other kernels.

Download

• For 4.0.3/4.0.4 ICS: stable
  
• Experimentals: all files
  (read bottom of FEATURES list below for description - keep in mind that these are *experimental*, i.e. NOT STABLE)
  
  • 2/21 2.2.0 exp1

FEATURES

• Patched to latest in Linux 3.0.x branch: 3.0.20, which was released 2/6/12 (lots of new/updated kernel code).
  
• All unnecessary kernel components removed to make kernel lean and fast!
  
• OC to 1.35Ghz (Michael Huang, optimized by me). Boot speed is maxed at 1.2ghz within kernel (in addition to ramdisk) for stability.
  
• GPU overclock to 384mhz and undervolted.
  
• User voltage control (Michael Huang, fixed and enhanced by me).
  
• InteractiveX V2 (screen-off hotplug of cpu1) added. Select it using setcpu if you want to use it.
  
• Ramdisk tweaks (sysctl, vm, filesystem speed, etc.)
  
• SWAP & zram (next generation compcache) support. Run "zram enable" in terminal.
  
• init.d support in ramdisk.
  
• HotplugX governor (Hotplug optimized and modified for screen-off suspend).
  
• cpufreq backport from Linux 3.3
  
• rcu code backport from Linux 3.3
  
• other linux 3.2/3.3 backports: dm, futex, voltage regulator, memory compaction, etc.
  
• Undervolted by default (1.35ghz/1325, 1.2ghz/1300, 920mhz/1250, 700mhz/1150, 350mhz/950)
  
• Experimental version features (in addition to stable build):
  
  • Two extra slots (180mhz or 230mhz) and 1.42Ghz. (These slots will not work for everyone - USE AT OWN RISK)
    
  • ColorControl from Ezekeel
• lkflash - script to flash latest versions of leanKernel from Terminal (type "su" without quotes, hit enter, then type "lkflash" without quotes and then hit enter)
  
• checkv - voltage checking script (for custom undervolting) - detailed at bottom of this post.

CHANGELOG
(* next to version indicates versions that were general regarded as rock stable)

• v1.0.0 - Initial release
  
• v1.0.1 - Fixed power off charging (only upgrade if you care about that).
  
• v1.1.0 - rcu code updated to linux 3.2-rc7, boot speed max forced to 1.2ghz within kernel (stability), hotplug governor should be more stable now, zram enabled including custom enable script (run "zram enable" in terminal), small bug fixed in voltage control code.
  
• v1.2.0 - interactiveX V2 with hotplug support, user undervolting works now, and all speeds undervolted by default (clear setcpu settings before flashing), ALSA SoC driver updated to 3.2-rc7
  
• v1.2.1 - reverted a dep voltage change I made in 1.2.0. Only update if you're experiencing stability issues in 1.2.0 (if your coming directly from a version prior to 1.2.0 make sure you clear custom voltage settings)
  
• v1.3.0 - re-wrote a lot of my user undervolting code (fixed some bugs and probably introduced others - haha), updated dm and futex code to linux 3.2, gpu undervolt at top speed, some code cleanup. (clear setcpu settings before flashing). Oh one more thing: undervolting 1.35ghz and higher is not reliable yet and is not recommended.
  
• v1.4.0 - updated to Linux 3.0.15 (small release), voltage regulator driver from Linux 3.2, omap clock data updated from latest official omap source.
  
• *v1.5.0 - updated to Linux 3.0.16 (big update), more accurate/reliable user voltage control for frequencies less than 1.35ghz.
  
• v1.6.0 - read this post.
  
• v1.6.1 - *battery drain - being fixed*, updated to Linux 3.0.17, fixed potential memleak in slub allocator, small omap4 update from android-omap source.
  
• v1.6.4 (pulled - stay tuned) - moved some of the features off of 1.6.1 (but kept them in experimental) in order to fix/pinpoint potential source of battery drain possibly introduced in 1.6.1. You do not need to upgrade from 1.6.1 if it's working fine for you. Cpufreq updated to Linux 3.3.
  
• v1.6.6 (bd0730ad3f57e050942356b647821256) - Fixed pm_suspend bug introduced by the Linux 3.0.17 patch *this fixes battery drain issue in 1.6.1 and 1.6.4*. Where's 1.6.5?
  
• v1.7.0 (a7f3d241d68fd48c9f216e8399226e9d) - a bunch of fixes and updates from android-omap source including the hotplug fix, deadline scheduler updated to linux 3.2.
  
• v1.7.1 (c2d0d4c59c198bb3f2281f164442ac0f) - removed some omap patches from 1.7.0 that may have been causing issues.
  
• v1.7.3 (049a8ce4be0f0a392d6c0b694de1ad73) - went back to 3.0.16 base as I suspect there were more things in 3.0.17 causing subtle issues in releases newer than 1.5.0. Added a fix to reduce screen unlock lag in interactiveX. Brought back some of the OMAP patches from upstream android-omap source.
  
• *v1.7.4 (3619144bee4cd86883692b48971ee5f8) - applied the rest of OMAP patches from android-omap source. Partially updated to 3.0.17. Wireless ADB support (if ROM has built-in support for it).
  
• *v1.8.0 (7ddb6ac13d01ceaeed25b83ab13afb8c) - Updated to Linux 3.0.18 (big update - lots of fixes/changes). An omap driver fix. A fix for stalling RCU processing. Ramdisk changes for CM9 (or CM9 based ROMs) compatibility. This version should theoretically be smoother than the previous versions.
  
• v1.9.0 (f703a8912d4dd19f82cc4bf17f37f1cd) - detailed log here.
  
• *v1.10.0 (e9f2c4f2b458ddddeebfba842bb51756) - updated to Linux 3.0.20, completely modernized memory management compaction/migration code to Linux 3.3-rc3 (which also includes backporting much of the mm code)
  
• v2.0.0 (a6a518d0a243c071ef6c02445acf2645) - detailed log here.
  
• v2.0.1 (d9457f5fd0d9a74bc1c7fe37e1856907) - custom UV related issues (haptic feedback, volume, etc.) fixed. Custom UV code improved.
  
• v2.1.0 (3362b0879e8a11681dc3e78eef38e4aa) - detailed log here.
  
• v2.2.0 (41296a907dd27cbc25593dbbda0e7fe0) - detailed log here.

DIRECTIONS
Uh.... flash the zip in clockworkmod.

FAQ

SOURCE
lk-stable

Thanks to forum member maddler for providing file hosting: http://www.host4droid.com/

Third party mods (not tested by me so use at your own risk)

• Jakes lean tweaks.

Donate to your favorite charity, or donate to me.

Edited by imoseyon, Yesterday, 09:20 PM.

[joshnichols189]

About to load this up! Loved your work on the Thunderbolt, glad to see you developing here too!

[paratox]

zImage anykernel format update.zip would be nice!

[imoseyon (OP)]

paratox, on 26 December 2011 - 10:53 AM, said:

zImage anykernel format update.zip would be nice!

I modify my ramdisk pretty heavily actually, so one could extract the zImage from my zip file and make an anykernel version out of it but you wouldn't get the true leankernel experience that way.

[GchildT]

What are the benefits of this...

SWAP & zram (next generation compcache) support. Run "zram enable" in terminal.


on the Galaxy Nexus. Why do we need SWAP/compcache. The device has plenty of memory....

[imoseyon (OP)]

GchildT, on 27 December 2011 - 06:55 AM, said:

What are the benefits of this...

SWAP & zram (next generation compcache) support. Run "zram enable" in terminal.


on the Galaxy Nexus. Why do we need SWAP/compcache. The device has plenty of memory....

Good question. I think the jury's still out whether zram is going to help on the gnexus. I don't think it will hurt. Having zram enabled (by running my script) will definitely keep your apps around in memory longer. If that's the desired effect you should give it a try.

[imoseyon (OP)]

Ok here's exp3: http://cl.ly/Ctvi

This version includes interactiveX V2. It's interactive with early_suspend (screen off) support, and when it suspends it hotplugs out cpu1! In other words, it shuts down the cpu entirely. Then when screen is turned on, cpu1 hotplugs back in.

This should be the best of both worlds between interactive and hotplug, if it's stable.

It's experimental so use it at your own risk.

[mdeevee]

imoseyon, on 27 December 2011 - 08:16 PM, said:

Ok here's exp3: http://cl.ly/Ctvi

This version includes interactiveX V2. It's interactive with early_suspend (screen off) support, and when it suspends it hotplugs out cpu1! In other words, it shuts down the cpu entirely. Then when screen is turned on, cpu1 hotplugs back in.

This should be the best of both worlds between interactive and hotplug, if it's stable.

It's experimental so use it at your own risk.

Pulling the trigger now, will let you know how it goes!

[Troet]

Hi imoseyon. Thank you for your work on this kernel. Just want to give a little feedback.
I'm running exp3 with interactivex, no OC on AOKP maguro Milestone 1 and up to now everything is stable. Sometimes there might be a slight lag when I unlock the phone. Otherwise the phone is very fast.

[TheRealBeesley]

Hmm.. My phone locked up and wouldnt finish boot. Tried both new kernels in the OP. Wiped cache/dalvik. Ruh ro.


Now its boot looping. Anyone else?


Wiped again.. maybe my voltages were too low. didnt seem like it before tho. Anyway, all is well

Edited by TheRealBeesley, 30 December 2011 - 11:56 PM.