[KERNEL] [AOSP] leanKernel: minimalistic kernel (v5.1.0, 11/16/11)

This is a minimalistic Thunderbolt kernel based on the official gingerbread kernel source, patched to 2.6.35.14, and then a bunch of lean mods added (look at feature list below).

DOWNLOADS:
1) lean (normal lean version), 1) 184Mhz (184Mhz can be unlocked via st - note for many people 184Mhz is unstable and cause issues, also supports outgoing call recording)

speedtweak.sh
This script will allow you to "transform" your kernel into normal, extreme, 1.92, 1.92X and battsaver versions (ie. it allows you to control speed, voltage, and slots to a certain degree). Once you run the script, everything will be self-explanatory. To run the script:
1) Open Terminal Emulator (install it from market if you don't have it).
2) Type "su" (without quotes) and hit enter.
3) Type "speedtweak.sh" (without quotes) and hit enter.

leanKernel kernel speed tweaker
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1) normal: undervolted, overclocked to 1.41Ghz
2) extreme: extremely undervolted, overclocked to 1.41Ghz
3) 1.92: undervolted, overclocked to 1.92Ghz
4) 1.92X: extremely undervolted, overclocked to 1.92Ghz
5) battsaver: extremely undervolted, not overclocked

6) Unlock 184Mhz
7) Lock 184Mhz
8) View current settings

Please type 1, 2, 3, 4, 5, 6, 7, or 8:

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Click to collapse

speedtweak.sh and SetCPU
The risk of running setcpu is that it can inadvertently override the min and the max that were set by the speedtweak script. (oh it can also override the governor setting but that's not as bad). Other than that it's pretty harmless - it can't mess with the voltage settings. So if you're going to use SetCPU, keep this in mind. One way to make this work is to use SetCPU to configure governor and min/max, and use speedtweak.sh to configure voltage settings. Or just don't use SetCPU.

FEATURES

1. Includes lots of goodies from kernel source (2.6.36.x & 3.x from kernel.org) newer than stock.
2. speedtweak.sh script to adjust clock frequencies and voltages.
3. SVS - manual voltage tweaking via /etc/init.d/01vdd_levels
4. InteractiveX and ondemandX governors! Added my own suspend code to interactive and ondemand code to make the phone lock at low clock speed when screen is off. No need for sleep setcpu profile anymore.
5. For 1.92Ghz builds, interactiveX and smartass governors were modified to minimize unnecessary spikes above 1.8Ghz to keep phone stable.
6. vm, minfree, memory, buffers readahead buffer tweaks
7. All unnecessary kernel components removed to make kernel lean and fast!
8. low # (5-10) of cpufreq slots for simple management and less governer transitions.
9. Undervolted for longer battery life.
10. SWAP and EXT4 enabled.
11. Filesystems mounted via EXT4, and tweaked for performance.
12. init.d enabled in ramdisk
13. TUN, CIFS, NSIO (netspector) module support
14. zram (from linux 3.1) module support (to enable, go into Terminal, type su, and then type "zram enable" without quotes). What is zram?
15. TINY_PREEMPT_RCU.

CHANGELOGS

4.2.0 (10/28/11) - last "stable" kernel based on cm7 source.
5.0.0 (10/29/11) - based on official kernel source from HTC.
5.0.3 (11/1/11) - bluetooth, video playback, scaling frequencies sysfs all fixed. audio levels tweaked. netspector(nsio) module upgraded to 2.0.
5.0.4 (11/13/11) - 5.0.3 with audio levels reverted stock for better compatibility with MIUI (no need to upgrade from 5.0.3)
5.1.0 (11/16/11) - cpufreq and cpuidle updated to linux v3.2rc1, suspend support for LTE, 184mhz version supports in-call recording now (outgoing only).

DIRECTIONS
Uh.... flash the zip in clockworkmod. You may need to wipe Dalvik cache and/or delete /data/misc/dhcp, /data/misc/wifi.

Donate to your favorite charity, or donate to me.

GOVERNORS
First, my take on the governors that are out there: http://xdaforums.com/showpost.php?p=13020648&postcount=617
I offer three governors: interactiveX, ondemandX, and smartass. What are they?

• interactiveX - it's the interactive governor from CM, but I added suspend/wake logic so when the phone screen is off it runs at below 400Mhz. Also, I modified its code some more to minimize unnecessary cpu spikes above 1.8Ghz if you happen to be running one of my 1.92 kernels. Most tbolts are unstable above 1.8Ghz, and it's the quick jump above 1.8Ghz that usually locks up the phone. It will hit 1.92Ghz only when it makes sense (ie. sustained high load). This is my favorite governor - perfect combination of speed and power efficiency.
• ondemandX - ondemand governor code from latest linux source *plus* the suspend/wake logic described above, except it has the ability to ramp to 369Mhz while screen is off. No additional code was added for stabilizing above 1.8Ghz.
• smartass - smartass code from erasmux, but I wasn't happy with its performance so I tuned it for quicker ramp up in speed. It has the same suspend/wake logic as ondemandX, and the same >1.8Ghz stabilizing mod as interactiveX.

Source code
AOSP: https://github.com/imoseyon/leanKernel-tbolt-gingerbread/tree/aosp

AOSP FAQ

1. Wifi is not working - 1) first make sure you flash kernel via CWR, not kernel manager or rom manager, 3) clear dalvik cache, 2) delete all files in /data/misc/wifi and /data/misc/dhcp, and reboot.

Ok full change logs for v2.5.2test2 sense:

v2.5.3test2 (5/19/11) - fixed BT, backported usb stuff from ace kernel including otg, changed overclock/undervolt to safer values.

gonna work on wifi tethering today.

nerogold said:

This new kernel fixed the slow charge for you or updated jcase gbread rom? I did both and my phone refuses to charge.

Sent from my ADR6400L using XDA Premium App

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Click to collapse

That is weird, mine charges fine. I'll try to look at this today.

Derrtydozen said:

I don't know if this was posted before, so i apologize if it has;

Here are my questions;

How can having the 184 slot unlocked be worse? (I saw this posted with no explanation in the old thread)

I've used all governors on batt saver and all run smooth as butter, so which will give me best battery life? I understand interactiveX is for performance and efficiency, smartassx and ondemandx are both kinda similar.....

I adjusted the voltage to the lowest values that my phone could handle but my battery life was worse than before.....

Excuse my noobishness

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Sometimes extreme undervolting can do more harm than good. If your phone is not getting enough juice then it can have unpredictable results. Try bumping up voltage to see if it helps.

Natef53 said:

I've been waiting to flash this until the camera and USB issues were sorted out.

The GingerJane thread says "PSCII.apk (chingy) - fixes usb mounting with custom kernels"

...does this mean that I need to flash that file to fix USB mounting or is it already fixed on YOUR v2.5.2test2?

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Click to collapse

So turns out USB mounting wasn't really broken with the kernel. There's some compatibility issues with the leak connect to pc app. You'll need the new PSCII app for usb mounting to work. Both jane and gingeritis should have the new apk now.