Develop Bugs

Defy heating

Hi anyone does look at the temperature sometimes? My defy (cm7 default 1ghz) is about 40-42 C after playing for a while and there is about 35 C outside. Obviously at 800mhz it is a bit lower. Share your experiences!!
Best regards.
Ernő

Hi,
i think it is absolutely normal at such ambient temperatures.
My Defy is currently 37C at 26C ambient currently running stability test at 900MHz.

u should try to undervolt some frequencies to get lower temps, check the setVsel settings thread

GPU undervolt

Hello,
Just wondering if anyone has experimented with Tegrak Overclock Ultimate's GPU optimization settings. It allows you to undervolt the GPU. Has anyone tried this and is there any benefit to battery life savings with this? I am playing around with the settings right now, so I'll post my results later. So far been able to undervolt the 267 mhz step by -75mv from 1000mv down to 925mv (900mv is unstable for me). And I undervolted the 160 mhz step by -150mv from 900mv down to 750mv. There is also a 200 mhz step I haven't played with. Perhaps keeping the GPU at 200/160 can yield potential battery savings when playing games because games drain the battery so fast.
Hm. I seem to be able to undervolt the 200 mhz step to 750mv as well. I'm going to run a 200/160 gpu setup at 750mv and see if I can save any battery playing Gun Bros and will let you guys know.

caaznkid said:
There is also a 200 mhz step I haven't played with. \
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Really? I only have the 267 and 160 MHz clock settings available. Any thoughts anyone?
Oh, I have underclocked my GPU settings but only by a modest 25mV each.

There's only 2 steps, but u can change the clock between 160, 200, and 267

yep ... good results
Yep I've been experimenting with GPU undervolting and had some sucess. So I was methodically working downwards and testing stability... then i saw this thread and thought what the hell, right? I shot for lowest mv of 750 and it's rock solid at 200mhz.
Can confirm 750mv stable at 100, 134, 160 and 200mhz. 267mhz can't be undervolted that much.
I've locked 200mhz 750mz for both speed steps and left it at that. Phone has yet to display any instability in a couple of days of mixed use including gaming. Battery life better? Subjectively yes, mostly I notice phone doesn't get so hot playing Dead Space.
Power consumption scales down almost linearly with clock cycles, and exponentially with voltage (right?). So by my math GPU is using about 40% of the power it does at full 267mhz. I wonder what the TDP of the exynos 4210 is and how much the Mali 400 contributes to that, would give some idea of what battery life to expect. Since GPU sits idle a lot, I doubt it's a magic fix.
Such is the power of our phones I have to underclock the CPU and GPU quite far before any 3D game gets too choppy to play. 160mhz is more than fine for most.
Usually undervolting makes the most sense for power saving because a given computing workload takes a certain number of cpu cycles. But 3D usually tries to render as many frames as it can, with the exception of S2's 60fps frame cap. So slowing down the GPU to no more than you need might improve gaming battery life?
My SGS2 is a bit sensitive to undervolting although underclocking of CPU, so I'm happy be able to so agressively undervolt the GPU.
I'd be interested to know who else can just set 200mhz & 750mv and have it rock solid? If not, 200/800 or 160/750?

I've rarely had problems when I use Tegrak. Then again, I undervolt 100mv on my cpu between 200-1000mhz, and about 50mv on my GPU at 267mhz with the noop scheduler and tweaks enabled. If I can get Tegrak to work with the Gunslinger kernel (currently causes reboot loops when I load the overclock module), I'll report back on battery life with Tegrak and experiment a little more.

jyaworski said:
I've rarely had problems when I use Tegrak. Then again, I undervolt 100mv on my cpu between 200-1000mhz, and about 50mv on my GPU at 267mhz with the noop scheduler and tweaks enabled. If I can get Tegrak to work with the Gunslinger kernel (currently causes reboot loops when I load the overclock module), I'll report back on battery life with Tegrak and experiment a little more.
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I had the same problem with Gunslinger, I decided to keep my phone on Rogue Stock EL29.
I've been able to drop my GPU Level 0 Clock to 160mhz and voltage to 850mv with out any issues.
I also keep my GPU 1 Clock at 100mhz and my voltage at 750mv without a problem.
Using noop of course.
Changing GPU clocks and volts doesn't help much.
Keeping your CPU Internal Voltage and Core Voltage -50mV and keeping it scaled 200-800 MHz will give you much better battery.

I think the effect would be more significant in ICS since ICS use GPU to render UI

Best kernel for D851 Fulmics 6.1! Your opinion!

If u are using the fulmics 6.1 which is your best kernel so far for this rom???
Is it better than fulmics stock kernel??
Pros and Cons???

Solid Kernel is really smooth (you will see a significant difference overall and in antutu 3d section). If you leave the settings as is, however, it will drain the battery quickly and you will get around 3 hours sot with moderate usage(throughout a day). I use the following kernel aduitor settings and they make a difference without compromising too much in my experience.
!(Backup system partition in twrp before modifying anything)!
Assertive display: On if mostly indoors, off if mostly outdoors
Cpu: Max freq.=2457 Min freq.=300 Input boost=1497
Hotplug: Idle freq.=1574 MinCpuOnline=2 Multicore power savings=enabled (aggressive causes heating)
Cpu Voltage: (undervolt) -100mv for lowest 3 freqs, -50mv for highest 3, -75mv for all between those
Thermal: Set limit for 70 degree celcius
Gpu: governor= msm adreno tz, Gpumin=200, adreno idler on, idlewait=3, set all other sliders in the middle for other idler settings. (Adjust few steps based on your experience) also you can use 300mhz gpu min freq for buttery smooth performance.
!All those are based on personal experience so it is possible that this condiguration may not work for you!

For those who are having erratic batter percentage!!

Hello xda,
I have been having the erratic battery behavior for a long time [i have the tablet for 3 years now].
I have sent it for maintenance on warranty and they changed my battery but no use!
The erratic behavior occur mainly while playing games i.e gpu workload....
But there was no kernel that allowed me to undervolt the gpu untill now
I flashed lineageOS with the tool deathly auditor and set the maximum gpu freq. To 420 mhz
The problem was alleviated but not completely resolved.
I also used battery HD app to monitor battery percentage and battery volatge during playing games and what i found is interesting.....
The battery suffers sudden sever voltage drops while playing gpu intensive games
This was alleviated by undervolting and decreasing maximum gpu freq.
I hope this helps someone regards.
Rydj

I also forgot to mention that i soldered the battery directly to the board but that didnt help either
As it was thought that the erratic battery behavior was due to cracked soldered joints of the battery connector.
BUT I CAN CONFIRM IT STOPPED SHUTTING DOWN AFTER I SLAM THE BACK COVER!!

rydj said:
This was alleviated by undervolting and decreasing maximum gpu freq.
I hope this helps someone regards.
Rydj
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Thanks for sharing
I also have the same problem.
I gave the note to my son and got myself a tab-s2, he is not so happy with the battery.
If he plays non intensive graphic games battery lasts hours, but a bit of graphic and its dead in an hour.
Can you please share your undervolt and max gpu numbers?
Do I need to undervolt and change cpu governer too ?
Are you on Nougat?
OP says:
GPU Control:
GPU Time in States - Same as CPU Time in States (Times in each frequency)
GPU Frequency Control (not yet supported on Nougat)
GPU Voltage Control (not yet supported on Nougat)
GPU Governor Control (not yet supported on Nougat)
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Best balance in performance+overheating?

I am talking about custom tuned governors, I/O settings and even voltages. Currently running CRdroid and i turned on the cpu info overlay, and even with conservative numbers( cpu 60 C) the phone someties becomes unresponsive.
What i experienced that if you use a performance tuned governor, like intelliactve even tho the boost is apparent it reaches a point where its no longer usable because of overheating. My phone goes into 80C+ zone after like 1 minute of using.
I had 95C cpu one day, had to reboot to cool it. Any tips, and setting to share? :fingers-crossed:

Just do the thermal mod. Put a thermal pad on the RAM chip. I recommend a 1mm pad so you dont run into screen fading issues in the future.