yashsingh1/xdaforums huggingface dataset:
[Xperia Z General] Haldi4803:
the GPU goes down to 128mhz. you can set performance GPU governor and set 128mhz! (just for testing... GPU won't go in sleep like that!)

for stress testing I use Linpack... under volt frequency. performance gov. linpack tests... if it doesn't crash instantly it seems stable. so I'm gonna use it on this setting for everyday and see if it crashes or not.
[Xperia Z General] tanoxxx:
thanks, i have maked the test with Antutu Benchmark and my system seems stable :)

i want to share my Undervolt:

with System Tuner i given -125 at all frequence..

untill now all ok :good::)
[Xperia Z General] sea2605:
Thank you Haldi. Still didn't understand the benefit of underclocking the gpu, since the voltage stays the same. How does (128 mhz and) a NOT sleeping gpu increase battery life?
[Xperia Z General] Haldi4803:
it does not xD except you play games the WHOLE time. Not even sure how much the GPU is used while web browsing because the GPU reports offline as last used frequency ~.~ and when checking via Trepn profile i'm sure the overlay is GPU rendered -.-
[Xperia Z General] sipe1:
I'm using your voltage and it's working perfectly. Do you still use them or you changed a bit?
[Xperia Z General] BoneMo:
still using...considering higher OC with working voltage up to 1150 which is stock for 1.5Ghz.
[Xperia Z General] ethan3686:
The only reason i cant try this is i dont want to loose BRAVIA ENGINE by unlocking the bootloader which is necessary to use this kernel :(
[Xperia Z General] :
if i underclock my xperia z to 1ghz will it get slow?
[Xperia Z General] MafiaManV:
Only you know that . Root and try it ;) . You don't have to change kernel for that

I'm using 1.24ghz, and don't notice any signs of slowdown
[Xperia Z General] :
can i disable 3 cores?

i dont understand why i need 4 cores running when im using apps

they should be enabled only when gaming or something like that

iphone 4 use 1 core and its smooth no need 4 running for nothing
[Xperia Z General] BoneMo:
kernel tuner app can do it :D, at least it has on/off buttons
[Xperia Z General] Mr.Dadulka:
I am underclocked to 1,24 , absolutely no sign of slowdown.

Regarding 4 cores - no need to restrict that, they are used very rare, maybe during some gaming. Normal system using doesn't used other cores I think.

Swyped from my sweet JB powered Sony Xperia Z.
[Xperia Z General] :
i think all the cores are on

but on low mhz like 216 or somthing
[Xperia Z General] Supersaiyan.IV:
Keep in mind that it's more power efficient to let the CPU ramp up, get the job done fast - then immediately go to sleep.

That said, turning off cores will drain your battery faster.

Myself I simply changed the governor to on-demand for all 4 cores, and undervolted it only slightly to not jeopardise IO.

The values here are too low even for my PVS:3.

Sent from my C6603
[Xperia Z General] Haldi4803:
So about Cores On/Off and Battery drain....

Mostly you run on 2 Cores! you can check that via Cool Tool or Trepn Profiler Overlay.

If you want to deactivate Cores you need FauxClock app and deactivate MP Decision then you can use Kernel Tuner to set Active cores as you wish. You can also set an individual Clock to each core! (also works without deactivating mpdecision)

But be warned! Kernel Tuner is set to activate previous settings after reboot!

If you really save battery by setting core clock to 1ghz instead of 1.5ghz.... well i wonder if you really need 1.5ghz for that simple task you're doing or if it's as fast done by 1ghz! And there is the question, when do all 4 cores get activated and when only 2 ? if you underclock to 384mhz will all 4 cores activate or will it take forever to finish ?
[Xperia Z General] heythem:
I used the settings from OP and it works very well.

So far I have 45% left on my battery

19hours 23min on battery with 40% used from the "Screen" While using 25-30% brightness
[Xperia Z General] Haldi4803:
Running Doomkernel V6!

These are not the absolut minimum values! but just these i tought might run stable and they do!

(Takes way to long to test the crash minimum of every frequency -.-)

M/GHz - mV

192 - 700

384 - 700

486 - 725

594 - 750

702 - 775

810 - 800

918 - 825

1.026 - 850

1.134 - 900

1.242 - 925

1.350 - 975

1.458 - 1025

1.51 - 1050

btw, frequencys not in this list cannot be set by Kernel Tuner, only Show up in voltage list! so they're still on stock voltage!

Tested via Kernel Tuner, all cores activated! all core same speed, Whealty gov, tested one Antutu Bench run without Graphics
[Xperia Z General] tanoxxx:
Here mine voltage..with Doomkernel v6

M/GHz - mV

192 - 700

384 - 725

432 - 750

486 - 750

540 - 775

594 - 775

648 - 800

702 - 800

756 - 837,5

810 - 837,5

864 - 850

918 - 850

972 - 875

1.02 - 875

1.08 - 925

1.13 - 925

1.18 - 950

1.24 - 950

1.29 - 975

1.35 - 975

1.40 - 987,5

1.45 - 987,5

1.51 - 1000

Untill now all worked perfectly without any reboot :) :good:
[Xperia Z General] brutal_noise:
My uv settings are almost the same, but I can't go under 1050mv for 1.51,1,45,1,40 :(
[Xperia Z General] tanoxxx:
Really? strange :confused: i use DooMKernel v6 and i can

i wanna share my last Extreme UV :)

M/GHz - mV

192 - 700

384 - 700

432 - 725

486 - 725

540 - 750

594 - 750

648 - 775

702 - 775

756 - 800

810 - 800

864 - 825

918 - 825

972 - 850

1.02 - 850

1.08 - 925

1.13 - 925

1.18 - 925

1.24 - 925

1.29 - 950

1.35 - 950

1.40 - 975

1.45 - 975

1.51 - 987,5

Untill now all work perfectly, without reboot or problem
[Xperia Z General] Mr.Dadulka:
@tanoxxx

I got 2 reboots today using your first undervolting setting with this usage

- undervolt by System Tuner (with setting max cpu when screen-off at 810MHz - I have disabled it already as I think It can cause some troubles

- it rebooted when using Runtastic and acquiring GPS signal and screen off - so I don't know at which level.

I will try to observe it further but I think it might be also related to that screen-off limited CPU level by System Tuner. It never reboot when screen on.
[Xperia Z General] tanoxxx:
Hi, yes, maybe setting max cpu when screen-off was guilty..but also we remember all cpu seems the same but are not really the same.. Sometime some value can't are good for all..

Try to remove setting max cpu when screen-off and check again.. Maybe you never get the issue again :)
[Xperia Z General] :
less volt means better battery and less heat am i right?

and speed is the same?
[Xperia Z General] BloodOmen777:
hmmm...strange
[Xperia Z General] tanoxxx:
Yes.. Can you have a very little bit decrease of speed..but is very very insignificant..
[Xperia Z General] ethan3686:
can this work without unlocking the bootloader?
[Xperia Z General] tanoxxx:
No, for custom kernel you need unlock it.
[Xperia Z General] tanoxxx:
after so many test this configuration for me is really stable :good: :)

Now i testing more Extreme Voltage, untill now it working so great, no problem and no reboot, when i finish my test i will share ;)
[Xperia Z General] xHok:
Lucky you, I can't go on 1.51 lower than 1050 :(
[Xperia Z General] Juzman:
192 - 700

384 - 700

432 - 725

486 - 725

540 - 750

594 - 750

648 - 775

702 - 775

756 - 800

810 - 800

864 - 825

918 - 825

972 - 850

1.02 - 850

1.08 - 925

1.13 - 925

1.18 - 925

1.24 - 925

1.29 - 950

1.35 - 950

1.40 - 975

1.45 - 975

1.51 - 1000
[Xperia Z General] G1_enthusiast:
can anyone do a heat test with stock voltage and UV to see how much is the heat difference and/or do a battery test? i ussually use stability test on my S3
[Xperia Z General] tanoxxx:
I wanna share my last extreme UV:

M/GHz - mV

192 - 700

384 - 700

432 - 700

486 - 700

540 - 700

594 - 700

648 - 700

702 - 700

756 - 725

810 - 725

864 - 750

918 - 750

972 - 787,5

1.02 - 787,5

1.08 - 925

1.13 - 925

1.18 - 925

1.24 - 925

1.29 - 937,5

1.35 - 937,5

1.40 - 962,5

1.45 - 962,5

1.51 - 987,5

Tested for 2/3 days, no problem and no reboot :good::)
[Xperia Z General] Juzman:
Set mine the same. Will see how it goes.

Edit: Had a SoD. So set 432MHz-810MHz @ 725. See how it goes.

Edit 2: Nope. Still locking up and rebooting. Back to previous settings and will have a play. :)
[Xperia Z General] Dsteppa:
Anyone knows why my under voltage values aren't being saved? Using System Tuner app.
[Xperia Z General] tanoxxx:
sin, luckily i havent any issue with this values :)

Strange, im using System Tuner too and i havent this problem..
[Xperia Z General] dron39:
...

What does it mean? PVS?

I'm newbie in undervolting i i try to understood this things.

Which app is best to change voltage settings?

I'm on RomAur v 2.31 for UB.
[Xperia Z General] Dsteppa:
You just go to voltage then adjust the Mv per Mhz and then you just save the file?
[Xperia Z General] tanoxxx:
All app making UV are good.. For example System Tuner is a good app..

To found the best voltage for your cpu (the cpu are not the same) change the voltage for one frequency and stress the xz..if you haven't any reboot or freeze this voltage is ok and you can use it.. Make this procedure for all frequency and you will found the correctly value...

Yes
[Xperia Z General] Haldi4803:
I prefer incrediControl for Voltage settings!
[Xperia Z General] dron39:
Ok. but what is PVS? (PVS:1, PVS:3)...
[Xperia Z General] gm007:
http://xdaforums.com/showthread.php?t=2052496
[Xperia Z General] Aman27deep:
None of you have posted screenshots of the on screen time. Please do.
[Xperia Z General] dron39:
Strange, but i have nothing (no results) in terminal emulator when i type "dmesg | grep PVS"
[Xperia Z General] Dsteppa:
Same here, but I use the terminal from System Tuner app.

Thanks, that works for me, no idea why System Tuner is biching.
[Xperia Z General] gm007:
You need to reboot your phone and try again.
[Xperia Z General] gm007:
I have pvs4 faster
[Xperia Z General] Dsteppa:
PVS 3 here.

Btw Gm, did you unlock the BL on your new XZ?
[Xperia Z General] gm007:
Not yet.
[Xperia Z General] Juzman:
So here is my new ones, working okay.

192 - 700

384 - 700

432 - 725

486 - 725

540 - 750

594 - 750

648 - 750

702 - 750

756 - 775

810 - 775

864 - 800

918 - 800

972 - 825

1.02 - 825

1.08 - 925

1.13 - 925

1.18 - 925

1.24 - 925

1.29 - 937

1.35 - 937

1.40 - 962

1.45 - 962

1.51 - 987
[Xperia Z General] Dsteppa:
Thanks, working good so far, only changed

1.29 - 937

1.35 - 937

To 950 each, since incrediControl didn't like me typing 937.

Working good so far.
[Xperia Z General] DINOZur:
Hi Everyone,

Just got my Z last week and I have the stock ROM and settings. Do you have any suggestions on how to extend the battery life?

Of course I turn off wireless connections (Bluetooth, NFC, GPS, Mobile data) whenever I don't need them. Other than that, nothing else was done or downloaded to preserve battery.

I am currently in minimum screen brightness for my screen, but the phone barely lasts a day.

During my sleep, my phone loses 5-10% of battery even if Stamina mode is enabled. Which is weird upon reading the posts above.

I'm curious about this Undervolt and Doomloader.

It's my first time for this kinds of phones btw, my previous phone is SE Xperia X10 :cyclops:
[Xperia Z General] Mr.Dadulka:
If i can recommend - uninstall chrome, disable maps (or greenify after root)

... then root > remove fastdormancy.apk and greenify.

And you will get much better battery time. You current times are not too much related to undervolting or so but target battery app eaters in background.

And of course read before you ask. ;)

Swyped from my sweet JB powered Sony Xperia Z.
[Xperia Z General] Juzman:
What if your mobile carrier supports Fast Dormancy?
[Xperia Z General] Mr.Dadulka:
Than he has to find it out and also it includes my other suggestion to read more and find what causes the drain. Everything has been discussed many times. :)

Swyped from my sweet JB powered Sony Xperia Z.
[Xperia Z General] DINOZur:
thanks a lot for your recommendations! :laugh:

I apologize for asking the same question again on this thread, it's just that some terms are jargon to me. hehe.

Anyway, does rooting my device void the Sony warranty? I haven't rooted any device before.
[Xperia Z General] Mr.Dadulka:
... it depends. There is warning that you do it on your own responsibility and warranty might be void.

From experience of other users it shouldn't be voided because of technical failures or some known problems.

And rooting itself shouldn't cause any trouble, in very most cases it's safe and not so difficult if you strictly follow the instructions.

Swyped from my sweet JB powered Sony Xperia Z.
[Xperia Z General] Supersaiyan.IV:
Hello everybody,

Thought I'd post the voltages for my PVS-3. For those that still don't know what PVS is - it's the CPU binning.

The higher the PVS, the more power efficient the CPU is and can operate at lower voltages.You could say it's a measure for the manufacturing quality of your CPU.

384000: 800000
432000: 800000
486000: 800000
540000: 800000
594000: 800000
648000: 862500
702000: 862500
756000: 912500
810000: 912500
864000: 937500
918000: 937500
972000: 962500
1026000: 962500
1080000: 1000000
1134000: 1000000
1188000: 1012500
1242000: 1012500
1296000: 1012500
1350000: 1012500
1404000: 1012500
1458000: 1012500
1512000: 1012500

Using Kernel Tuner to set the voltages and test for stability using StabilityTest v2.7.

All cores use the Ondemand governor, as ramping up the frequency, getting things done fast, return to idle - results in better battery life.

EDIT: Noteworthy - going below the current 1.5GHz voltage results in garbage. For me at least, you all should try which parameters work best for your CPU.

Sent from my C6603
[Xperia Z General] Dsteppa:
I also have PVS 3 and 975 Mv works fine for me.
[Xperia Z General] Supersaiyan.IV:
I know, believe it or not, I read the threads I post in.

Which is why I will now repeat myself:

Although I have a PVS-3 it cannot go below 1012.5mV.

Because each CPU is different there's no rule that the voltages posted here will work for each PVS-2/3/4.

Everybody needs to find their own lowest acceptable voltage value.

Sent from my C6603
[Xperia Z General] kennycol:
hi guys, thx for all the amazing inputs.

Just got a question, why are most people not changing 1.62 Mhz+ frequencies? Are those rarely used by the phone? more dangerous to change?

Thanks for your comments, if you do change those frequencies, whats would you suggest for psv1? :crying::crying: (bough like 3 weeks ago, sent from UK i tkink)
[Xperia Z General] xHok:
It's not worth to go above 1.62Ghz because you don't need the performance. It gets hot really fast and throttle down a lot so in the end, it is slower.

I am on 1.35Ghz and I haven't seen any performance issues yet.
[Xperia Z General] sea2605:
Well I found some issues with kernel tuner (or the doomkernel).

1. Init.d script isn't working, so all changes only stick after switching to the "set changes after full reboot"-setting.

2. If I set the voltages, then cpus clocking and governors(wheatly) then immediately exit kernel tuner the settings stick. BUT non of the cpus will ever go to sleep/offline (checked with system monitor several times). I do not have activated the htc one workaround-setting in kernel tuner (which keeps the cpus always online and might be some mpdecision thing)... I think cpus which are always on will drain more, even though they are underclocked and undervolted...

For testing purposes I opened kernel tuner (after undervolting and underclocking then exiting it) and manually switched cpu3 offline (see screenshot). Thats working...but it wont turn on until I manually switch it on again...

So right now I only have only bad options...

Either cpu0 to 3 always on, or switch cpus off completely...

Any solutions?
[Xperia Z General] phantom4u:
what tool should i use to change these settings? 'Voltage Control'?
[Xperia Z General] Alvaris:
Ok guys, I hate asking this problem again but i didn't want to remake the dead thread nobody responded to so..

Anyone else experiencing mediaserver battery drain?

I tried fixing it by transferring all of my photos to my pc, leaving only pics from screenshot, whatsapp and stock images. Mediaserver stopped draining for like less than a few days, and then it started draining again. So I transferred back all of them into the phone.

I also tried fixing it by deleting the album app and installing another album app(gallery ics); it didn't work.

Help please, seriously? This is the only issue i'm dissatisfied of about the phone.
[Xperia Z General] xHok:
I created .nomedia everywhere where I don't have any media files and also I checked all my mp3 files if they have any errors in them and deleted the ones which did. It solved it for me. Btw. there is already couple threads about this on this forum
[Xperia Z General] Alvaris:
I know, I even made one of them myself but didn't get any solutions. I pretty much searched as far as I could but found no permanent answers.

I'll try inserting .nomedia in every single folder to see if that works..

The problem with mine isn't the mp3, but something to do with the pictures. It starts draining after I access something album-related after a clean reboot.

How did you check for mp3 files if they have errors? All of my mp3s were transferred from my previous phone, the Galaxy S. I didn't experience this battery drain on that phone..
[Xperia Z General] xHok:
I use MP3 Diags
[Xperia Z General] Alvaris:
Hm, so I tried stuffing .nomedia files in various locations(except 100ANDRO, whatsapp and screenshots) and it still seems to be draining battery..

What kind of errors would mp3 files have which you removed?
[Xperia Z General] gm007:
How can you be sure that mediaserver is draining your battery?maybe something else.

My battery last for 1day with 4:30 hours screen on while the mediaserver keep awake is 40 minutes.

Download wakelock detector from playstore and check what is eating your battery.
[Xperia Z General] -Zork-:
Have a question, if I have stock kernel, could I uv? If yes, use a system tuner?

Enviado desde mi C6603
[Xperia Z General] Alvaris:
this is one of the highest it has been on(before charging, haven't refreshed)

aite, i'll try downloading that
[Xperia Z General] gm007:
Could be a game is doing this.
[Xperia Z General] Alvaris:
The only game i play is PAD though.. others are barely ever launched(cytus, jubeat, and o2jam which i recently installed)

running wakelock detector now, shall put up a screenshot of usage soon
[Xperia Z General] gm007:
Some games have push ads notifications,wont let the phone sleep well;)
[Xperia Z General] Alvaris:
Nah, I don't have anything like that

Ok, so apparently I screwed up my phone, hard by messing with .nomedia

some pictures appear as videos in album, random files from games are appearing on my album which wasn't there before

all music disappeared from walkman although the files are still there

there are no more .nomedia remaining left though

I plan to reflash stock firmware and wipe data+dalvik cache, and then transfer what i have from my previous titanium backup to the sdcard and restore from there. Sounds ok aye? or am i doing something really wrong..

i'll see how the battery drain goes again after i reflash stock firmware+restore everything
[Xperia Z General] gm007:
Don't restore data only apps.
[Xperia Z General] Alvaris:
The backup is from last month, it should be fine aside from possible battery drain which i'll find out why
[Xperia Z General] -Zork-:
Hi, i have ROOT . How to unistall remove fastdormancy.apk and greenify¡¿ Which folder are then.¿

Enviado desde mi iPad con Tapatalk HD
[Xperia Z General] xHok:
nomedia file works for subfolders too, are you sure you didn't forget one somewhere?
[Xperia Z General] tanoxxx:
this is my last very extreme value of UV:

192 - 700

384 - 700

432 - 700

486 - 700

540 - 700

594 - 700

648 - 700

702 - 700

756 - 725

810 - 725

864 - 750

918 - 750

972 - 787,5

1.02 - 787,5

1.08 - 925

1.13 - 925

1.18 - 925

1.24 - 925

1.29 - 937,5

1.35 - 937,5

1.40 - 962,5

1.45 - 962,5

1.51 - 987,5

untill now no problem and no reboot.. all work ok :good:
[Xperia Z General] Dsteppa:
You only have to remove greenify if you installed it yourself, it isn't there by default. So if you didn't install it: Don't worry about it then.

fastdormancy.ap if I'm correct it should by in system> apps folder (Use a root explorer to remove it)
[Xperia Z General] kingkooltoni:
I install Greenify, why i have to delete it ?
[Xperia Z General] Michealtbh:
If you're rooted use eXperience pro https://play.google.com/store/apps/details?id=aperture.ezekeel.experiencepro

Edit - I misread, that doesn't actually allow uv
[Xperia Z General] G1_enthusiast:
you dont have to...its an option.
[Xperia Z General] Alvaris:
Yeah, I've searched through every nook and cranny, used the search function of both my phone and the pc, found nothing

Reflashed stock firmware though, everything's fine now

mediaserver still draining battery even after this(transferred all my data and everything)
[Xperia Z General] gm007:
This? http://xdaforums.com/showthread.php?t=2262438
[Xperia Z General] Alvaris:
..I shall recheck overnight, will close all apps and see

usually without stamina mode on it drains like 20%++ in ~12 hours
[Xperia Z General] xHok:
Just disconnect it from the internet so you wouldn't get any whatsapp/Facebook messages and you will see. Btw. You can turn off the notification sounds in these apps.
[Xperia Z General] kingkooltoni:
Hey, i got a question. What is better.

1. Just undervolting?

2. Undervolting and set the CPU frequency down?

3. Undervolting, set the CPU frequency down and deactivate some cores?

Maybe some had try it and tell the experience :)
[Xperia Z General] Haldi4803:
Media server is not the Media scanner! Media server is activated every time your speaker make some noise/melody whatever!

Deactivated keyboard sounds?

Try Mute volume and Audio.

The activate Air plain mode and deactivate WiFi! Don't! Touch then phone for a few hours. Check back if you there is any wake lock or media server usage! If no reactivate Signal (and 3g) and let it rest for a few hours. (Don't touch no stamania mode)

If you don't have any median server usage then its coming from an app you use!

[MENTION=487924]kkt[/MENTION]

You can't deactivate cores, does that automatically with mp_decisions.

There are some people saying under clocking without undervolting will not bring battery life increasement. Idk. I did both.
[Xperia Z General] Alvaris:
Aite, I'll try that tonight when I go to sleep

I've been putting my phone on silent mode most of the time now, and I think the mediaserver consumption has drained a lot less battery o.O