Disabled arm topology and sched_mc
decreased the sensitivity (not too much) because of a non-scientific feeling that lowering it too much causes random jumps to 500MHz.
some platform-dependent merges with galaxy note sources
some stability fixes (at least it did not crash on my phone for the last two days)
BFQv3 & it is set as default I/O Scheduler
fixed NTFS auto-mounting
default governor is set to conservative@100-1200MHz
disabled all optimizations in /sbin/siyah/tweaks.sh

fixed GPU voltage & clock control
changed mali drivers with the one in galaxy-note
some usb driver fixes…
lowered smartassv2 desired freq to 500mhz and also lowered the up_threshold

fixed USB OTG
Added intellidemand governor. this is a modified ondemand governor and very battery friendly.
default lowest freq is set to 200MHz. default governor is still (tweaked)conservative.
some other tweaks & fixes
tweaked ondemand, conservative and ondemandx governors. I think stuck-to-800MHz problem is fixed.
Enabled some tweaks in tweaks.sh. video playback on external sd should be better now.
disabled hidden ssid in wireless driver to fix wifi tethering problems (thanks to Entropy512)
back to SLAB
fixed usb keyboard&mouse problems

SiyahKernel v2.5.1

FEATURES
Can be flashed on Samsung ROMs and AOSP Based ROMS. Currently all Samsung 2.3.4 & 2.3.5 based ROMS, CM7 and MIUI ROMS are supported.
Based on linux kernel 2.6.35.14 + drivers from Samsung sources
Auto-Rooting
ClockworkMod Recovery v5.0.2.7 with back button support
Custom boot animation support
Supports SetCPU (OC upto 1600MHz, UC downto 100MHz)
User customizable frequency steps. You can edit "freq_table" and use 25MHz as the lowest step and 1696MHz as the highest. You have 8 steps (it is fixed) but the frequencies can be set.
Supports undervolting (UV between 800 mV and 1500 mV)
Supports voltage control via SetCPU (thanks to netarchy, ninpo, hacre)
Stock voltages as default
smartassV2, lulzactive governors. and lots of other governors which are available as modules
Default governor is ondemand (200-1200MHz)
Tweaked ondemand and conservative governors
Compiler optimizations
user customizable charging speed (use at your own risk). you have to echo AC, MISC and USB charge currents to a misc device.
Touchscreen fix (thanks to vitalij)
Increased touchscreen sensitivity
GPU clock and voltage control interface (thanks to netarchy).
I/O, scheduler, hotplug and vm Tweaks
automatic battery calibration. (removed. thanks to Entropy512. we do not need battery calibration for SGS2)
Available I/O schedulers: noop, deadline, CFQ, BFQ, V(R) (default), SIO
Available CPU governors: see this thread for the list of available governors and modules (thanks to droidphile)
/system/etc/init.d startup scripts support
Automatic backup of efs partition. You will have the files in your sdcard as well as /data/.siyah directory. copy them to a safe location in case you may need them later.
Updated jhash to version 3
Increased charging speed.
BLN (thanks to creams), liblights is autoinstalled if the existing one doesn't support BLN
supports advanced touch tune driver. thanks to vitalij Link. the control app from Web, from [URL=market://details?id=com.tegrak.touchmove]Mobile[/URL]. Thanks to tegrak for the driver patch file download
2nd core application support (thanks to tegrak)
Automounting of NTFS volumes for USB sticks (ntfs on external card is not supported)
XZ compression for the kernel to have smaller image size. the size is still similar to previous versions after adding new features.
integrated new sha-1 and crc32 slice-by-8 algorithms
SCHED_MC enabled to have less power consumption. It will have a better support in the next version as it needs more changes in the scheduler code.
Lower brightness levels for low-light conditions to save battery.
Experimental brightness behaviour modification via setting min_bl and max_gamma values.
Native BLN support for CM7 based roms.
CIFS, SLQB, NTFS and several others that I forgot...

same features as in v2.5.2b but with the following exceptions:
no default undervolting. all voltages & clock values are the same as stock
SLAB (SLUB in 2.5.2b)
disabled CONFIG_RCU_FAST_NO_HZ
android logger is enabled (in v2.5.2b, you have to flash EnableLogger.zip to enable it)
dynamic bus frequency mode (in v2.5.2b it is static)

SiyahKernel v2.6.2

added lulzactiveV2 (thanks to tegrak). you can new lulzactive tuner app from the market to tweak lulzactive parameters.
added interactive(X) and intellidemand governors back. (other governors are still available as modules and can be loaded via insmod)
disabled smooth scaling for interactive based governors (interactive, interactiveX and lulzactive).
changed the wifi drivers again.
LZO compression for the kernel image instead of gzip. it has less compression but faster decompression. (in this case, bigger is better )
New mali drivers from Galaxy Tab Plus, PLUS the DVFS part which has 3 steps instead of 2. The second step clock is set to 267 instead of 266 to provide compatibility with voltage control app.
Cleaned up tweaks.sh and added thunderbolt.sh (thunderbolt scripts – thanks to pikachu01@XDA) to startup.
some tweaks and fixes
added j4fs back
fixed ondemandx governor
enabled sched_debug interface (pikachu01′s NO_GENTLE_FAIR_SLEEPERS line in thunderbolt script is active now)

SiyahKernel v2.6.1

fixed wifi driver causing boot loops when receiving a packet before being registered.
corrected the voltage level of 200MHz (should not be a problem but I did not want to have that silly [last_level-1]=[last_level-1] line. It should have been [last-level-1]=[last_level])
disabled ARCH_POWER sched feat. (just like in v2.5.2b)
enabled CONFIG_RCU_FAST_NO_HZ (just like in v2.5.2b)
reverted back to gzip -9 compression (2 seconds faster than xz -1)
fixed auto-rooting and CWMManager app disappearing. This should also fix ntfs mounting issues because ntfs-3g binary extraction problem was also related with the same bug.
some other config cleanups.
updated mc1n2_voodoo sound module (thanks to supercurio) and it is now auto-loaded.
android logger won’t be loaded if you create /data/.siyah/disable-logger file. it is added to siyah-battery.zip. don’t forget to remove it if you want to enable it back.

Changelog:
Fixed setting of lulzactive & smartassV2 parameters via scripts
battery optimized defaults.
updated codecs
removed siyah-battery, siyah-defaults and siyah-performance scripts from the blog. please remove all existing scripts before installing this version (or flash your existing rom again to remove all scripts). use init.d scripts if you know what you do, otherwise use VoltageControl app or ThunderBolt! scripts. use this CWM recovery flashable zip to remove previous 01siyah script. just flash it once and /system/etc/init.d/01siyah script will be removed.
CWM Recovery v5.5.0.4
Supercurio’s mc1n2_voodoo module fix. Voodoo Louder app should be working now.
Added additional vdd_levels interface (for undervolting) to provide compatibility with some additional apps

SiyahKernel v2.6.5
lowered bus frequency threshold
set lower GPU step back to 160MHz
lulzactive tweaks
enabled whitelist mode in wifi driver and disabled ipv4 and ipv6 multicast/broadcast packets
set charge_currents to 650 550 450 to relieve the thread of people who haven’t read that they have no effect.
put the throttling limits back (in tmu.c). this may prevent the phone shutting down on high load (such as games) but it will decrease the benchmark scores.
some fixes in thunderbolt.sh + some new vm tweaks
SLQB
default i/o scheduler is set to SIO
softlockup and hung task detections enabled

SiyahKernel v2.6.4
disabled third GPU step. new thresholds are “65% 20% 100% 20%” with 100-267-300 steps. third step will not be used if you keep 2nd-to-3rd threshold 100.
cleaned up v2.6.3 code and removed some experimental parts (which were not checked in anyway). this will fix battery drain issue.
reverted back to CWM v5.0

Changelog:
fixed the problem which is causing device turn on by itself when it is connected to a charger. (it was related with lulzactive changes in v2.6.5)
some more lulzactive changes
smoother “mr bones” playback in youtube
removed brazilianwax, interactivex, savagedzen and intellidemand governors.
fixed a nasty bug in interactive governor.
default governor is set to lulzactive
default i/o scheduler is SIO
XZ compression (this is not a feature but an explanation for smaller kernel size. I am sorry that I had to give up LZO because it gives me >8MB kernel image which exceeds the available kernel partition size)
(Possible)Tegrak overclock app support. although you may customize all the features with scripts, some existing tegrak overclock app customers may prefer to use it.

SiyahKernel v2.6.8
fixed the bug which prevented using ubuntu and was causing some random reboots
code cleanups (removed cleancache, zram, zcache, some jrcu configs etc)
set readahead cache on sdcard to 256KB (was 1024)
enabled cpu alignment again and SLQB (maybe the problems were related the bug in the first item. I will try them again)
enabled some more networking options in config as for the request from a close friend (ipip, l2tp etc)
Modified GPU frequency setting code a bit. if you use voltage control app or a script to set the second GPU step frequency higher than the third, the third frequency is disabled.
fixed most of the problems in korean edition
although I know this won’t effect performance or anything else, I used newest codesourcery toolchain.

SiyahKernel v2.6.7
lots of cpu governor changes
changed default governor to ondemand with sampling rate of 100000. use setcpu or scripts to lower it (or try conservative governor) if you prefer performance over battery life.
fixed usb related (OTG, mass storage etc) problems which were introduced in v2.6.6i

SiyahKernel v2.6.6i
some lulzactive changes are reverted back to have it scale slower.
ondemand governor is set as default cpu governor and merged with ondemandx and intellidemand governors. If you feel any lag, try conservative or lulzactive.
some defaults (hotplug parameters and governor defaults) are tweaked to provide better battery life
some wifi changes to prevent very frequent wifi wakelocks.
throttling frequencies are determined using smooth_target. if you do not modify smooth_target throttling levels will be the same as stock. if you want to disable only smooth scaling just set smooth_offset to 0 and don’t change smooth_target. if you set smooth_target to 0, the throttling levels will be 2 levels lower than stock which means you will have more performance when you overclock but also higher chance of lockups.

SiyahKernel v2.6.11
replaced the recovery with Hyperdroid Redpill Kernel Recovery. (Thanks to Hyperdroid team and Redpill kernel developer(s)). this recovery can also mount both internal and external sd. (thank you af974@XDA)
set the default cpu governor back to ondemand. conservative governor settings are still the same. ondemand governor settings are tweaked a bit (50000-90-5)
changed some mali internals (set staycounts for steps to: 0-1-1 and down threshold for second step is set to 35). I did not use AndreiLux’s settings for not breaking the compatibility with voltage control app but I highly recommend you try it because it can save a lot of battery juice.
some patches from upstream

SiyahKernel v2.6.10
default governor is set to conservative with sampling rate of 20msec. those who still say that lionheart is different than conservative governor should inspect the sources or those who don’t know how to do that should try this kernel to get a proof. if you still want EXACTLY the same lionheart governor, just flash lionheart.zip. Unlike what others say it will behave EXACTLY THE SAME as lionheart governor in void kernel if you flash it on this kernel, neak or several others who use netarchy’s change on conservative governor.
(postponed to 2.6.11 to make a fair comparison of the conservative governor effects) drastic changes in gpu frequencies (thanks to AndreiLux@XDA). you can use voltage control app to use modify them if they cause any lag in games or video playback but I didn’t feel any lag and they are just perfect. freq set is (40,167,267) with thresholds 85% 30% 80% 30%.
some other tweaks for performance and mostly battery life (made cpu hotplug threshods a bit high and some patches from upstream etc)
set default i/o scheduler to bfq. it seems that song skipping doesn’t happen with bfq @ 100MHz (thanks to bartito@XDA for the feedback)
applied Mel Gorman’s patches to SLUB allocator.
this release may not be as battery friendly as v2.6.9. I will make ondemand governor default and use different settings in v2.6.11 to target more battery life. apart from the slub allocator change (which should not effect the performance anyway) all changes in this release can be applied to v2.6.9 by using init scripts or voltage control app (just flash lionheart.zip and set i/o scheduler to bfq).

SiyahKernel v2.6.9
compiled with older toolchain which was used in 2.6.7 (codesourcery sourcerylite 2009q3) without optimizations
added Entropy512′s changes to sec_battery driver to show battery charging current and changed it a little bit to map the adc readings to real charging current miliamps (mapping is done in an unscientific way but it works). you will be able to see how fast your device is being charged and also why those 100%s are not the same. (thanks to Entropy512). since I don’t know how to read discharge current (maybe there is no way to read it) you will only read that data when your device is in charging state.
reverted the adbd in initramfs to fix MyPhoneExplorer phone keypad not functioning
added tegrak’s home key double click fix. (thanks to Tegrak)
set topoff current in battery driver to 100mA (stock value is 200mA) to ensure that the battery is fully charged before the charger circuit stops charging. Your 100% level will be a bit higher than before.
disabled cpu alignment and back to SLUB.
tiny tweak for ondemand (85-10:up_threshold-down_differential)

Changelog:
fixed BTHID issues (thanks to Entropy512)
updated SIO scheduler (thanks to Miguel Boton) and set it as default i/o scheduler once again.
some wifi driver changes to prevent wlan_rx wakelocks preventing the device to sleep
new cpuidle driver from galaxytab (thanks to Entropy512)
reverted top-off current back to default
some hotplug, gpu and cpu threshold changes…