Develop Bugs

What are safe CPU temps?

Does anyone know the safe temperature envelope for the Tab S?
CPUTemp is the app I use to monitor mine.
https://play.google.com/store/apps/details?id=com.yanyan.cputemp
In the past I have disabled DVFS using Xposed to reduce CPU throttling without issue. However this morning my 10.5 started getting very warm and sluggish. I checked and the DVFS module was spiking temps to 90C. Eek, not good. I re-enabled DVFS and temps dropped to high 60s low 70s. Don't know why the DVFS thing suddenly started causing problems but 90C is way way too hot.

I believe the main culprit here may be the latest release of Dolphin Browser 11.2. All other browsers are running at about 65C but Dolphin spikes to 85C. Not good. Will report this.
So may not be DVFS at all but Dolphin.

Running one run of antutu benchmark and the cpu temp peaked at 86c. That's without disabled DVFS.

win81-64 said:
Running one run of antutu benchmark and the cpu temp peaked at 86c. That's without disabled DVFS.
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Yep Dolphin is messed up. Huge temp spikes.

My SkyHigh kernel commit will answer your question
https://github.com/UpInTheAir/SM-T700-T705-Kernel/commit/ce1efd33185a5dcd2ad3d1cc989b23ee0153492b
CPU scaling decreased at 95 degC is normal and safe. Critical CPU temp at 110 degC

Cpu problem

My cpu is scaling to 900mhz, any one can help me to fix this at 300 mhz. I tried a lot of apps but nothing change, is there a tool to modify the cpu freq in the kernel ?

U hv to root ur phone and then install SetCPU...then set the min frequency as 300 mhz

prabhuinbar said:
U hv to root ur phone and then install SetCPU...then set the min frequency as 300 mhz
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I tried a lot of cpu apps, look no frills cpu, set spu etc.. But nothing change, see the attachment

in general section there is a thread with Thermal Config to prevent lagging and overheating by ravinder003
Use that thermal config

SH3H1 said:
in general section there is a thread with Thermal Config to prevent lagging and overheating by ravinder003
Use that thermal config
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I deleted the red lines in the thermal config too but now i just want to set my cpu min to 300, i juste want to modify the cpu freq in the kernel

What cpu frequency to set for gaming and also for battery saving

In No-frills Cpu set Governor to powersave and also go to nofrills cpu settings and check prevent changes from other apps.
However it may cause unexpected behaviour like hangs and slow down so better stay bit above of 300Mhz.

alok932 said:
In No-frills Cpu set Governor to powersave and also go to nofrills cpu settings and check prevent changes from other apps.
However it may cause unexpected behaviour like hangs and slow down so better stay bit above of 300Mhz.
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I tried but the cpu freq is not changing in the scaling_min freq, cpu is min is always scaling on 900, thanks for reply

Ferhat78 said:
I tried but the cpu freq is not changing in the scaling_min freq, cpu is min is always scaling on 900, thanks for reply
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Delete the thermal engine file. Then go to /sys/devices/system/cpu/cpu0/cpufreq/
There you'll see two files at the bottom ~ scaling_max_freq and scaling_min_freq
Change the values in them. See if it works.
EDIT: Seems like you already tried it.

alok932 said:
In No-frills Cpu set Governor to powersave and also go to nofrills cpu settings and check prevent changes from other apps.
However it may cause unexpected behaviour like hangs and slow down so better stay bit above of 300Mhz.
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Click to collapse
zTweaked said:
Delete the thermal engine file. Then go to /sys/devices/system/cpu/cpu0/cpufreq/
There you'll see two files at the bottom ~ scaling_max_freq and scaling_min_freq
Change the values in them. See if it works.
EDIT: Seems like you already tried it.
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Thabks for reply, but i can change the value of the cpu min scaling, it's impossible to change, i changed but after a reboot a have always 900mhz min

Ferhat78 said:
Thabks for reply, but i can change the value of the cpu min scaling, it's impossible to change, i changed but after a reboot a have always 900mhz min
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Check apply on boot in no frills cpu. However it wont always stay on 300 bcoz its based on performance. if you want it to stay near to 300 always then reduce max freq. If it still doesnt work and you are on miui then change your rom...Try using mokee rom.

alok932 said:
Check apply on boot in no frills cpu. However it wont always stay on 300 bcoz its based on performance. if you want it to stay near to 300 always then reduce max freq. If it still doesnt work and you are on miui then change your rom...Try using mokee rom.
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Tried kernel tuner 2014 and now the cpu is scaling on 300, thanks for reply everybody, thanks a lot for yours answers kernel tuner work perfectly but no frills cpu or setcpu doesnt work perfectly look like kernel tuner

Is there a kernel for cpu underclock on oreo?

Is there an oreo-based kernel to perform cpu underclocking? Or maybe a way to be able to do the underclock on android 8? Because most of them are only on android nougat, but on oreo no one has developed anything yet ...

AntoKemz said:
Is there an oreo-based kernel to perform cpu underclocking? Or maybe a way to be able to do the underclock on android 8? Because most of them are only on android nougat, but on oreo no one has developed anything yet ...
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There is an app I used on my old phone: https://play.google.com/store/apps/details?id=com.grarak.kerneladiutor
Sent from my Samsung SM-A520W using XDA Labs

AntoKemz said:
Is there an oreo-based kernel to perform cpu underclocking? Or maybe a way to be able to do the underclock on android 8? Because most of them are only on android nougat, but on oreo no one has developed anything yet ...
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Click to collapse
You can underclock with stock kernel if I know correctly.

The stock oreo kernel of a520f supports these features and it should apply to (Exynos) most custom kernels, all devices across A 2017, and most related devices.
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq - Max clock of cluster 0, reduce to underclock the CPU.
/sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq - Max clock of cluster 1, reduce to underclock the CPU.
/sys/power/cpufreq_max_limit - Max clock of both clusters, more forced once permissions are set, watch device temperatures.
/sys/power/cpuhotplug/max_online_cpu - write a number 1 to 8, it is the CPU cores that are online.
Maybe relevant:
/sys/class/misc/mali0/device/dvfs_max_lock - GPU clock, more forced once permissions are set, watch device temperatures.
/sys/class/misc/mali0/device/core_mask - The GPU core combination in use, write a number 1 to 7.
/sys/class/misc/mali0/device/dvfs_governor - GPU governor, write a number 1 to 3.
/sys/class/devfreq/17000010.devfreq_mif/max_freq - could affect cellular and wifi
/sys/class/devfreq/17000020.devfreq_int/max_freq
/sys/class/devfreq/17000030.devfreq_disp/max_freq
/sys/class/devfreq/17000040.devfreq_cam/max_freq
The CPU governor is with scaling_max_freq though only userspace performance interactive.
Reboot to undo changes.
Edit:
/sys/devices/system/cpu/cpufreq/mp-cpufreq/cluster0_max_freq
/sys/devices/system/cpu/cpufreq/mp-cpufreq/cluster1_max_freq
Though this should not exceed the max clock, in addition to the governor's settings(/sys/devices/system/cpu/cpu[0-7]/cpufreq/interactive/...), the CPU clock is boosted temporarily when the screen is touched, the activity is changed, etc, even when it might not be needed. It's often "touchboost", and could be disabled by enabling medium power saving, or,
/sys/power/cpufreq_min_limit (home, gesture, scroll, app change, unlock)
"644 permissions" - disabled
"664 permissions" - default
check its contents after changing, should be the CPU min clock.
/sys/class/input_booster/level (touch, long touch, multiple fingers, etc)
0 - disabled touchboost
1 - low
2 - default
3 - high
might need the permissions being 464
CPU 4-7 needs to be powered on before cpufreq becomes available in its folder.

sheepkill15 said:
You can underclock with stock kernel if I know correctly.
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Instead of what I understand, with the normal app type cpu master, or no frills cpu you can not change the clock of the CPU and the governor, but with the app Kernel Adiutor, recommended by @iloveoreos is possible, it is very strange this thing. However, despite the underclock of the CPU you can not then earn so much battery, it seems void

AntoKemz said:
Instead of what I understand, with the normal app type cpu master, or no frills cpu you can not change the clock of the CPU and the governor, but with the app Kernel Adiutor, recommended by @iloveoreos is possible, it is very strange this thing. However, despite the underclock of the CPU you can not then earn so much battery, it seems void
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It doesn't count that much because you rarely use the cpu max freq. Maybe try underclocking the gpu too, if you can but probably not and there's not much else to do

AntoKemz said:
Instead of what I understand, with the normal app type cpu master, or no frills cpu you can not change the clock of the CPU and the governor, but with the app Kernel Adiutor, recommended by @iloveoreos is possible, it is very strange this thing. However, despite the underclock of the CPU you can not then earn so much battery, it seems void
Click to expand...
Click to collapse
The cpu and gpu are managed by the OS and its resepective governor settings. Little will be gained by reducing cpu cylcles unless it's correctly managed.
The single biggest battery user is the screen. Either reduce the brightness to the lowest you can stand and limit its on time or use powersave mode which will reduce both screen and cpu/gpu frequency.
Also selecting a more suitable governor helps.
If you frequently use high cpu usage apps its pointless using a conservative governor as you'll just lag the device. An ondemand governor would be better suited.
You can also set apps to be killed the moment you leave them in the developer settings.

ashyx said:
The cpu and gpu are managed by the OS and its resepective governor settings. Little will be gained by reducing cpu cylcles unless it's correctly managed.
The single biggest battery user is the screen. Either reduce the brightness to the lowest you can stand and limit its on time or use powersave mode which will reduce both screen and cpu/gpu frequency.
Also selecting a more suitable governor helps.
If you frequently use high cpu usage apps its pointless using a conservative governor as you'll just lag the device. An ondemand governor would be better suited.
You can also set apps to be killed the moment you leave them in the developer settings.
Click to expand...
Click to collapse
The problem is that with the only governors we have in stock are interactive, performance and userspace. The kernel allows me to just adjust the cpu, and on android oreo we do not have custom kernels that allow me to do anything. So in addition to lowering the brightness, really there is nothing that thanks to xposed and the root that allows me to do at least 5 hours of screen? The upgrade to oreo ruined everything, Nougat was too perfect

Why Cpu All Core Working Without Use Any App?

Cpu Every Core Working Without Use Any App in Recent List

It shows 633Mhz for me (first four cores)
which rom you are on ?
however background processes of Android do take cpu usage

YasuHamed said:
It shows 633Mhz for me (first four cores)
which rom you are on ?
however background processes of Android do take cpu usage
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I Think Other Core Should Stop When Not Use Any App in Recent

I does not seem to work like that. I have never seen my Redmi having a single idle CPU core
Sent from my whyred using XDA Labs

RupeshRN said:
I Think Other Core Should Stop When Not Use Any App in Recent
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You think wrong

RupeshRN said:
I Think Other Core Should Stop When Not Use Any App in Recent
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stock min freq is little 633 mhz big 1130mjz
underclocked can go to 300mhz both big and little.
you mean a hotplug.. when not in use all cores off then whn input turn on... unfortunatelly theres no hotplug for 636.. as they say in kernel settings balme qualcomm

Question Performance increase with magisk ?

Is there a real way to increase performance in realme c21 without overclocking
I have root access with magisk installed
Can these magisk modules increase performance

well, it really depends on what you're going to do or what you want to. what about disabling Thermal throttling and setting a different CPU governor?

By disabling thermal throttling I'm turning my phone into a bomb
Nowadays lot of phone are blasting
Even though my thermal throttling is enabled my phone is in 50°C while playing games lol

Zartazor said:
By disabling thermal throttling I'm turning my phone into a bomb
Nowadays lot of phone are blasting
Even though my thermal throttling is enabled my phone is in 50°C while playing games lol
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lol, rn I'm using my s4 mini without even thermal management, running very fast and cold, or if u can call 64celsius cold... but anyways, my tips are using kernel auditor and setting min CPU speed to the minimum you can, and max to the max you can set, and also setting the CPU governor to interactive or OnDemand

Please suggest a CPU governor
applesucksLmao said:
lol, rn I'm using my s4 mini without even thermal management, running very fast and cold, or if u can call 64celsius cold... but anyways, my tips are using kernel auditor and setting min CPU speed to the minimum you can, and max to the max you can set, and also setting the CPU governor to interactive or OnDemand
Click to expand...
Click to collapse

Zartazor said:
Please suggest a CPU governor
applesucksLmao said:
...interactive or OnDemand
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