yashsingh1/xdaforums huggingface dataset:
[Galaxy S II Original Android Development] jlevy73:
K18 has been great, battery life seems improved to me over K17/K16. With moderate usage I'm able to get about 18 hours. On k17 it was typically around 16 hours.
[Galaxy S II Original Android Development] :
Exactly the same usage although not always perfect 3g, not a minute more...but with 7% remaining :((

checkrom v3.1.1, speedmod 18 test 3
[Galaxy S II Original Android Development] richyy74:
Previously I was not clear, so:

For me there was no significant difference between k16/k17 and undervolted kj2/kj3 in battery life.

K18 is much better. At the end of the day I come up with 15-20% more battery remaining.

Sent from my GT-I9100
[Galaxy S II Original Android Development] giorgosaero:
With k18 test3 my phone its a little laggy....but with k18 test2 its rocket....i dont care about batery only for speed ;-)
[Galaxy S II Original Android Development] alexkno:
Sorry was not clear. On k17 those 3 to 5% is for the whole night, so about 8hours
[Galaxy S II Original Android Development] planetf1:
Not really noticing the phone lag any more compared to previous kernels. Very minor hiccup on XDA forums but have had that before. 18test3
[Galaxy S II Original Android Development] doongoo:
+1 with k2-16. I must say to, that I realy rearly play games, which need higher CPU performance
[Galaxy S II Original Android Development] morg01:
Had a hot reboot whilst making a phone call with k18-test2.

Installed test 3 and had an interesting occurrence last night, the phone was turned off and i plugged in the charger, the battery charging screen came on so I left it to it.

This morning I switched the phone on and the phone hadn't charged at all, it remained at the same level as when i turned it off (about 30% left after a full day of email surfing etc . . . nice work hardcore!) . . . that said this shouldn't be kernel related because androids not running?

Incidentally the phone charged when i turned the phone on, no problem, so I'll keep an eye on things . . . .

edit: think I might have some sort of hardware failure / bug? . . . went back to 18 test 2, turned phone off and tired to charge, had a little warning triangle next to the battery icon appear, then it started to charge, but the battery level doesn't correspond to the known level, ie I'm at 62% in android, but the phone powered off battery icon shows something like 10-20% . . . strange :-/
[Galaxy S II Original Android Development] pacc:
I'm getting 2% discharge with Tegrak Kernel for 9h-10h overnight using only one core.

I was considering moving back to Speedmod which has been my preference since 1st day, but I think this Tegrak tweak is definately a keeper.
[Galaxy S II Original Android Development] BrandoHD:
For me 18 test 3 is really good on battery life, where as test 2 wasn't, was able to get 1d 3h and had 50% left on test 3, and that's with my normal use, percent drop while sleeping was great, even while I had wakelocks some serious wakelocks because of Google+ app

ON test 2, it was dropping pretty fast while sleeping, without the wakelocks, hope this helps in some way....
[Galaxy S II Original Android Development] Seifer1975:
Want to report that the SOD issue hit me again using test2, despite on XXKI3 modem. This seems to be an issue with the K18 kernels.
[Galaxy S II Original Android Development] hardcore:
It doesn't seem to be a deal breaker though. Since the phone will work after 5-6 seconds. Might be something to do with the new deep sleep state, which could be giving improved battery life.

Will try to toggle it and see.
[Galaxy S II Original Android Development] lrcquest:
tried 18 test 3. having problems with the scrolling & navigation. There seems to be stutter in there. Also, faced the blue flash problem once. Did not revert back to 17 & now running on 18 test 1. Deepsleep is ok. Will post the battery stats later as bit premature to comment on the first cycle.
[Galaxy S II Original Android Development] isd88:
do you think coudl be possible to add an option in the menu to choose the touch sensitivity? i like very much 0 setting but someone has problems with this
[Galaxy S II Original Android Development] EarlZ:
Mine becomes jittery or even unresponsive at times.
[Galaxy S II Original Android Development] hardcore:
K1-T16:

More optimizations:

- Switched to CONFIG_TREE_PREEMPT_RCU

- Switched to SLAB instead of SLUB

- Disabled CONFIG_FTRACE
[Galaxy S II Original Android Development] LuffyPSP:
wow nice 3 updates in one evening(at my place at least) :D
[Galaxy S II Original Android Development] GuestK00150:
hey hardcore!

really love your kernel! good work ;)

Is it compatible with cm7? If not, possible to do this?

The cm7 kernel has the same problem that the Ninphetamine kernel has. They are both consuming a lot of battery from apps usage (specified as android os in battery stats).

THANKS in advance - have a nice sunday :D
[Galaxy S II Original Android Development] renton82:
I'm with stock kg3 kernel and the yellowish tint disappeard in the left side... is this kernel based on kg3? Can u make something for this issue? I'll be very happy to mount this kernel like sgs!
[Galaxy S II Original Android Development] renton82:
I've tried now your kernel, but the left side became yellow again, i'm now with stock kg3 waiting for your modify...
[Galaxy S II Original Android Development] mach0boi:
2.3.4 sources aren't out yet so this kernel is still based on 2.3.3. That's why yellow tinting is still present :)
[Galaxy S II Original Android Development] miisterlim:
Currently on ninphetamine 2.0.2, but will give this a go and see how it goes.

P.S love the update speeds
[Galaxy S II Original Android Development] xinfinityoO:
does this kernel have that issue?? have u tested it
[Galaxy S II Original Android Development] Galaxy s2:
Srange mine seems ok at moment:confused:
[Galaxy S II Original Android Development] GuestK00150:
this kernel doesn`t have this issue, everything fine for me on cognition 1.31. switched to cm7 yesterday...
[Galaxy S II Original Android Development] isotoper:
Will I lose my data if I will install this kernel over Cognition 1.31 ?

Do you have better impression than the one came with Cognition 1.31 which is Ninphetamine-2.0.2 ?

Thanks!
[Galaxy S II Original Android Development] mach0boi:
No you wont lose any data :)
[Galaxy S II Original Android Development] isotoper:
Thanks, Can it be installed through recovery ? Or should I use Odin only :cool: ?
[Galaxy S II Original Android Development] mach0boi:
Odin only because it is a .tar file. You can also install it using CWM app but you need to extract first the zImage file inside the .tar :)
[Galaxy S II Original Android Development] holgalee:
Greetings from a fellow S'porean and many thanks to you, Speedmod! I'd used your kernel for my SGSI and am really pleased to see your work for SGSII. Thank you for sharing you work so generously!

Didn't realise that my SGSI looked a little blueish until I used your tweak to make the tone warmer. I'm hoping you can add colour tweaks to SGSII as well, to reduce the Disney colours and gradient banding.
[Galaxy S II Original Android Development] isotoper:
I'm not so familiar with odin, where can i find installation instructions?

Thanks.
[Galaxy S II Original Android Development] mach0boi:
The same as flashing cf-root. If you don't know what odin is, stay away from this and any other kernel thread. :)
[Galaxy S II Original Android Development] eybee1970:
You do not need to extract the tar....just flash it with cwm app
[Galaxy S II Original Android Development] Mustoura:
Ok retested 18.3 after doing all of the above battery life settled down now on 17 hrs at 71%

The stutter is still there it seems to be intermittent i wonder if its the cpu speed it wakes up at think i might look into this before reverting back to 18.2 for now as it is fluid smooth battery life is still good for me .
[Galaxy S II Original Android Development] pjdona:
Even this problem to me yesterday. After 5-6 seconds the phone is awake. The Test 2 Kernel is the best, super smooth!

PJ
[Galaxy S II Original Android Development] FrenchSparda:
I cant find Test 18-2 in OP...someone can post it ?
[Galaxy S II Original Android Development] alexkno:
faced an issue with 18.3: during phonecall near my ear (distance sensor on) I accidently pressed power button instead of volume up (was holding the phone in wrong hand).

Phone call went on as normal, but after finishing the dsiplay didn't turn on. Pressing power or home button didn't solve the issue. I was about to take out battery when suddenly after 15-20seconds the display went on
[Galaxy S II Original Android Development] Mustoura:
Ok i have found when the cpu is running at 200 xda scroll stutter is evident . (normally when coming out of deep sleep ).When cpu runs at 500 and up the scroll stutter is gone .

This is on 18.3 .

Just thought i might share that if anyone else wanted to test that out for them self.
[Galaxy S II Original Android Development] lrcquest:
http://www.box.net/s/7mt5c6qr2afkfcj2ad2m

Thanks to stylez
[Galaxy S II Original Android Development] mariosraptor:
Went back to test2 only because it is soooooo smooooooth! Thanks Hardcore!!!!
[Galaxy S II Original Android Development] pacc:
Seems like a tie between test2 and test3... which way will the developer go?

I vote for test2 also! Speed is what "Speed"mod is all about!
[Galaxy S II Original Android Development] rodak:
OK, thanks for this great kernel. Works really well with good battery life.

But can anybody explain those "fake" wake locks in battery graph?

According to the battery graph my phone has been awake a lot.

Looks like about 40-50%.

But there is no drain and BBS says the awake time is only 9.8%

Edit: More details: Kernel T18 Test3, Modem KI4, Rom: Villain 3.0. No scripts, no setcpu.

Edit 2: Added screenshot from CPUSpy
[Galaxy S II Original Android Development] dzontra11:
Interesting indeed..
[Galaxy S II Original Android Development] BrandoHD:
It says in your screenshot that Widget Locker, Activity Manager, Gmail and Titanium Backup has had your phone awake for approximately 10 minutes, that's at least 10 minutes (based on what is seen in screenshot) where your screen was off and your phone awake...

I usually ignore "activity manager" though

EDIT:

That is 9% of the total time the phone has been on I.E 32 hours, if you look you will see that your screen on time is 2h 7m and awake time is 3h 10m, that hour difference is where your screen is off but the phone still awake, i.e the wakelocks in your graph
[Galaxy S II Original Android Development] rodak:
Yeah, but 10 minutes of 28 hours is not much.

If you look at the "battery graph" screenshot it looks like almost 40-50% of that "Awake" line is blue, but it doesn't add up.

I have a total of ~3 hours wake time, but that line in my eyes show 10-15 hours but that is not true.

Hence the " symbol in front and after "fake" wake locks.
[Galaxy S II Original Android Development] BrandoHD:
It doesn't seem that bad imo, but that first graph can be open to one's own interpretation, the actual figures leave roughly 1 hour where your phone is awake and the screen is off...
[Galaxy S II Original Android Development] rodak:
I don't think you fully understand me. I don't think it's bad. Just wonder why battery graph reports tons of Awake time and better battery stats reports something else. Seen other users reporting the same behavior but none got any explanation of this strange behavior.

If you compare blue line of screen on and awake you see there is much much more awake. Even if I don't notice any drain and better battery stats don't show any strange and long wakelocks.
[Galaxy S II Original Android Development] morg01:
are you receiving lots of push email? . . . that will wake you phone for brief periods of time, thus if you have a lot of push email then you'll get lots of little occurrences of awake time
[Galaxy S II Original Android Development] akbarhash:
Here is some test figures for k18 2. Stock rom jpkj2. No battery saving software etc 2000 mah battery. I think it is pretty good considering auto brightness.

http://imgur.com/a/EEkYU

Sent from my GT-I9100
[Galaxy S II Original Android Development] BrandoHD:
Do you have anything set to sync automatically?

Seems you have very close to zero wakelocks.......
[Galaxy S II Original Android Development] planetf1:
I've just seen some strange behaviour for the second time. I'm running with KJ3 & 2-18test3. In full the rom is PDA:BUKJ3| PHONE:BUKI1| CSC:VODKI2

My apps are carefully selected to have low wakelock counts, thanks to BBS

I leave sync etc enabled. Highest 3 are 3 mins/2min/2mins

Deep sleep % is generally in the 95% range over a few hours (no use)

I happily had 17 hrs use with 40%+ battery remaining yesterday and a few hours online (details in a previous post)

Oddly today I've noticed my battery usage has been going down nearly linerarly whether in use or not. And also irrespective of my power chart showing awake or not. I'm down to 50% after 8 hours and around 1:45 screen on time. System has been awake over 4 hours (and 1:45 screen time)

That's not awful, but is a lot heavier than yesterday.

Also I did see Android OS at 75% - and yes that could be the usual reporting error

Definately looks like an issue sleeping which I can't explain.

Another main difference from yesterday is

Yesterday

- At home

- quiet high signal WLAN

- off the scale 3G strength (femtocell)

today

- in office

- very busy medium signal wlan

- low 3G signal

Last time I had the issue it appeared to relate to WLAN traffic. I forgot that & have just flipped to Siyah kernel (and rebooted) for sake of a comparison (though my heart is with speedmod)

It may be more appropriate to try a switch from the KI1 modem to KI3 or KI4 - does this include wlan code as well as cellular? WOnder if I can flash modem with HC-Ktool
[Galaxy S II Original Android Development] akbarhash:
I have Facebook Google+ whatsapp. Facebook messenger gmail. Today is a good day with less wakelocks.

I will post a screenshot of wakelocks screen. Give me some time.

Edit: Here you go

http://imgur.com/a/5eTMU

Sent from my GT-I9100
[Galaxy S II Original Android Development] FrenchSparda:
Thank you ;)
[Galaxy S II Original Android Development] planetf1:
I looked again at my power usage chart and confirm that the poor usage started at about the time cell signal strength went green->yellow ie the time I got to work
[Galaxy S II Original Android Development] :
Wow 3+ hours screen on time and battery looks like at 50%?? That would be a dream.. Gotta buy that 2000 mah battery!!
[Galaxy S II Original Android Development] henriquesb:
Seems like which ROM we're using makes a difference between test2 and test3. First time I tested test2 was with VillainROM 3.0 KI3, and drained more than test1 or test3.

Now I'm on stock KI8 with some frozen Samsung apps and test2 seems similar in battery drain to test3, also quite smooth.
[Galaxy S II Original Android Development] akbarhash:
I get around six hours easily with no compromise. If I go extreme saving seven is also possible but that is no sync no auto brightness using wifi of when screen off. Then what is the use of having this phone better off with some dumbphone. 5 and a half with some gaming thrown in the mix.

For me it was a good investment.

PS Talking about 2000 mah battery.

Here is a few screenshots at 4h screen on battery left 33%.

Sent from my GT-I9100
[Galaxy S II Original Android Development] crash_194:
Giving test 5 a blast now hardcore, thanks for doing us a new one! First impressions is it isn't quite as smooth as test two scrolling through touchwiz home screens? Could just be placebo though? I'll run for a few days and post back.

Thanks again, your a legend! :-)
[Galaxy S II Original Android Development] alexkno:
Updated to test 5 now, let's see, till now on ki8 deodexed stock k17 was best for battery for me, hope it can compete ;)

Edit: first quadrant score was 4395 that is awesome, best before for me was 4200 with test 2...I know it doesn't mean anything. Just a remark
[Galaxy S II Original Android Development] crash_194:
Ignore that, there's no issue with the smoothness at all here for me on a stock kj3 rom.
[Galaxy S II Original Android Development] lrcquest:
Stock video player non functional in test 5. Tried wiping both caches. But mobo player its working.
[Galaxy S II Original Android Development] n00n00:
giving test5 a try too. not really seeing any difference so far in terms of smoothness. still feels the same. :)
[Galaxy S II Original Android Development] Pfeffernuss:
Using Test5: as smooth as Test2 (very important), very good benchmark results (nice) and stock video player works (ofcourse).

No idea about battery life yet but it appears to be dropping quite rapidly (which every smooth kernel does more or less).

(edit: 1000MHz still rarely being used though... Skips from 800 straight to 1200)
[Galaxy S II Original Android Development] It_ler:
SpeedMod K2-18 test2 was fastest kernel on my phone, whereas test3 was best for battery life.

Now testing test5.

P.S.:

Quadrant Standard shows about 4500 point for test5 (had about 4300 points for test3 and about 4600 points for test2).

But CF-Bench shows less Java score (and as consequence less overall score) for test 5 than for test 2 and test 3.

Other benchmarks show similar results for all of my tested SpeedMod K2-18 kernels.

System seems to be fast enough for me anyway ... and is always faster than every stock kernel I had running on my phone.
[Galaxy S II Original Android Development] gee2012:
When flashing a new kernel, is it wise to wipe the cache and dalvik-cache before flashing?
[Galaxy S II Original Android Development] It_ler:
Hmm ... just flashed SpeedMod K2-18 test5 kernel as well, and stock video player works fine.

If you already have wiped cache partition and Dalvik cache in recovery mode, then you could try to clear the app data of the video player too.

(Settings menu => Applications => Manage applications => All => Videos => Clear data)

Maybe that will help.

Good luck !

---------- Post added at 10:02 PM ---------- Previous post was at 09:59 PM ----------

No, it is wise to wipe cache partition and Dalvik cache in recovery mode after flashing.

That will prevent most issues (app FCs) - kind of best practice.

P.S.:

Wiping before flashing does not help a lot, but it does not make something worse either.
[Galaxy S II Original Android Development] AMDPOWERFIST:
Ok....

There is a really easy way to test a ROM / KERNEL combo to see which is better with battery....

Using the Better Battery Stats app you can see when wakelocks occur.

Using CPU Spy you can see what your phones processor state is and for how long (200mhz to 1200mhz)

But there is a highly under rated app that i dont think many people know about or use. Its called Battery Monitor Widget (Free and Pro versions)

What this app does, is actually meausre the VOLTAGES in the battery itself, and shows you a mah/pHr output via a widget and can also calibrate its own statistics based on precise measurements from when it is drained to charged.

Free Version here:

https://market.android.com/details?...ch_result#?t=W251bGwsMSwxLDEsImNjYzcxLmJtdyJd

Pro Version here:

https://market.android.com/details?...ult#?t=W251bGwsMSwxLDEsImNjYzcxLmJtdy5wcm8iXQ..

I am not sure how "accurate" these readings actually are, but they seem to be fairly good. It also shows u history of the battery, you can create battery profiles (for people who swap out batteries often OR want to test multiple types of batteries from ebay or wherever.)

Thought i would post it, so people could have a look for themselves.

Cheers
[Galaxy S II Original Android Development] davepenn:
test3 is best for battery life for me at the moment
[Galaxy S II Original Android Development] ephraim:
@hardcore did you redo the ondemand tweaks in 18test5 like the one on test 2 ?
[Galaxy S II Original Android Development] mariotme:
Test 5 running smooth as butter! discharging battery fully and going for a full night charge.
[Galaxy S II Original Android Development] giorgosaero:
K18 test5 dont have the smooth of k18 test2....wait for batery test...
[Galaxy S II Original Android Development] pjdona:
Never seen a kernel so fast and smooth ... crazy ... fabulous ... thanks hardcore...18 beta 2!
[Galaxy S II Original Android Development] micmaccc:
k2-18-t5 the stuttering while scrolling in xda dev app is gone! :D
[Galaxy S II Original Android Development] Radikaal:
Can anyone be very kind and provide a link for K2-18-test2? :) (its removed in the downloads section)
[Galaxy S II Original Android Development] jsompis:
Look on page 441.
[Galaxy S II Original Android Development] stylez:
Will depend on post count per page ;)

My post history in this thread will show a link to most except newest on box share...

__________________

Test 5 smooth as test 2.. yet to test battery life.
[Galaxy S II Original Android Development] micmaccc:
K2-18-test2

this is what u want

http://xdaforums.com/showpost.php?p=19341889&postcount=4234

;)
[Galaxy S II Original Android Development] Seifer1975:
Looks like I must be a very poor tester because I really cannot tell the difference between test1 to 5. :D
[Galaxy S II Original Android Development] hardcore:
they should be quite similar. How do u find battery life on k18 vs K17 or k16?
[Galaxy S II Original Android Development] spirt:
scrolling lags in XDA app are back for me in test 5. don't know how it's possible, but CPU spy shows 102% deep sleep overnight.
[Galaxy S II Original Android Development] hansation:
i'm loving k2-18 test3.. amazing battery life. kudos to hardcore
[Galaxy S II Original Android Development] alexkno:
First night with test 5. Lost 4% battery in 8 hours with data off and Wi-Fi off. Exactly the same for me like k17 which was for me the best up to now for battery.

Will watch what happens with syncing and data on during the day, but I have a good feeling.

Additionally I have back now colors in my battery stats for reception signal bar.
[Galaxy S II Original Android Development] shahulvm:
++1000 for the battery life
[Galaxy S II Original Android Development] iggybuenaventura:
Test 5 is smoother than test 3. Good job. :D
[Galaxy S II Original Android Development] zarboga:
Really hope SpeedMod developers can make this ROM for i9100G
[Galaxy S II Original Android Development] bryant_16:
Do we need to wipe any davlik cache after flashing this kernel?

My firmware is still 2.3.3 when using this kernel? Is it alright?
[Galaxy S II Original Android Development] beaver2233:
Ha.
[Galaxy S II Original Android Development] iggybuenaventura:
Depends on what firmware you're on before flashing this kernel.
[Galaxy S II Original Android Development] lrcquest:
Wiping the caches is recommended as it will help to avoid problems later on.

Also, some posts earlier, there was a link for samsung_ultimate_kernel_cleaning_script_by_lippol94.

It is

optional

but you can use this prior to flashing a new kernel.

Suggest you upgrade to 2.3.5 as its better performance, look & feel. If you prefer stock, Intratech's frankenstein roms are really good as you can mix & match your preference.

http://xdaforums.com/showthread.php?t=1075278
[Galaxy S II Original Android Development] Jonjungle:
Hi Hardcore, so far the first 3 K18 have not matched K17-test1 for battery life on my end. I see that K18-Test5 has PREEMPT mode like K17. Will check it out soon.

Thanks.
[Galaxy S II Original Android Development] hardcore:
Actually K18-test5 has the PREEMPT mode like K16.

K17 and K18-test1,2,3 have PREEMPT_VOLUNTARY mode.

Thanks for the feedback. What kind of a difference in battery life are you noticing?