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Is second core of Xperia V disabled?

Hello,
Is XV's second core disabled in default? In trickster mod I see "core1: disabled"

jokamaciek said:
Hello,
Is XV's second core disabled in default? In trickster mod I see "core1: disabled"
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Nope.. The second core is used dynamically whenever additional cpu power is required. And in the times where one core is enough, core 2 goes "offline", which might be detected in your app as "disabled"
Sent from my LT25i using xda app-developers app

I have made the same observation.
But it is a valid question. It's a documented trick to disable cores in multi-core CPU's, and only have them triggered by benchmark apps. At least German magazine CT was unable triggering multi-core operation under normal usage. Only when certain benchmark apps were used the other cores jumped in. Another case is CPU speeds, where they throttled the CPU frequency for getting good battery marks. They never managed to induce max speed, only benchmark apps did that. In particular Samsung mobiles have become infamous for that.

[Start monitor your cores] - [tw dvfs issue]

Hey guys !
I started monitoring cpu cores on galaxy s5 ( g900f ) and I saw that after a while of use all 4 cores randomly get stuck online ( just like my previous galaxy note 3 N9005).The issue is due to TW DVFS( DYNAMIC VOLTAGE AND FREQUENCY SCALING).Start monitor your cores with perfmom or system monitor or whatever and post your findings. Have fun and maybe some of you can start a petition for Samsung to disable DVFS !
Fix for non rooted :
*nothing permanent...only a reboot can fix the issue untill it happens again.
Fix for rooted :
*reset mp-decission or add a script to reset mp decission every day at a hour you decide ( not permanent )
*install xposed framework with samsung dvfs disabler module from playstore ( from what I tested disabling dvfs in wanam xposed doesn't work ) - this is a permanent fix

DVFS Disabler not working?

Kriomag said:
DVFS Disabler not working?
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For now no more 4 cores stuck online with dvfs disabler on but I need to do some more testing.

Does this happen at random?
Are there any symptoms?

Have you tried this: https://play.google.com/store/apps/details?id=com.mugich.cpumulticorecontrol
I have succesfully disabled two cores, but whether that helped with battery that might be a difference story.

Hellscythe said:
Does this happen at random?
Are there any symptoms?
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Yes it happens randomly but disabling dvfs did the trick with 4 cores stuck online.

cerobles1 said:
Have you tried this: https://play.google.com/store/apps/details?id=com.mugich.cpumulticorecontrol
I have succesfully disabled two cores, but whether that helped with battery that might be a difference story.
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I will but it doesn't bother me if it runs with minimum 2 cores if doesn't affect battery life. Will report later.

ciprianruse88 said:
I will but it doesn't bother me if it runs with minimum 2 cores if doesn't affect battery life. Will report later.
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I'm sure the battery penalty of having 2 cores online at 300mhz over only 1 core would be minimal but I have also noticed the issue that sometimes all 4 cores will stay online despite very low cpu usage. All 4 cores would be clocked down to 300mhz but essentially doing nothing with only 5% cpu usage.
Edit: Like with you, a reboot solves this issue. Either way I have not noticed an impact on battery life.
An excelelnt way to easily monitor which cores are active is a free app called "CPU Stats" which shows 4 small cpu usage bars in the notification panel.
https://play.google.com/store/apps/details?id=jp.takke.cpustats&hl=en

egps2 said:
I'm sure the battery penalty of having 2 cores online at 300mhz over only 1 core would be minimal but I have also noticed the issue that sometimes all 4 cores will stay online despite very low cpu usage. All 4 cores would be clocked down to 300mhz but essentially doing nothing with only 5% cpu usage.
Edit: Like with you, a reboot solves this issue. Either way I have not noticed an impact on battery life.
An excelelnt way to easily monitor which cores are active is a free app called "CPU Stats" which shows 4 small cpu usage bars in the notification panel.
https://play.google.com/store/apps/details?id=jp.takke.cpustats&hl=en
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I use perfmom to monitor my cores. It's free if you download it from chainfire's thread or you can pay for it in playstore. Btw I didn't get anymore 4 cores stuck online since I disabled dvfs with xposed + samsung dvfs disabler module from playstore. Also battery life has improved just like it did on my note 3 since I disabled dvfs.

ciprianruse88 said:
I use perfmom to monitor my cores. It's free if you download it from chainfire's thread or you can pay for it in playstore. Btw I didn't get anymore 4 cores stuck online since I disabled dvfs with xposed + samsung dvfs disabler module from playstore. Also battery life has improved just like it did on my note 3 since I disabled dvfs.
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Wanam Xposed has a DVFS disabler too, reckon that will work the same?
Also isn't DVFS implemented to prevent overheating of the device under stress? Could you explain why it would increase battery life if your CPU cores were fully "unleashed" without temperature throttling?
cheers

Hellscythe said:
Wanam Xposed has a DVFS disabler too, reckon that will work the same?
Also isn't DVFS implemented to prevent overheating of the device under stress? Could you explain why it would increase battery life if your CPU cores were fully "unleashed" without temperature throttling?
cheers
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On my previous device (Note 3) disabling dvfs through wanam xposed didn't worked (some other users tested with the same result) . Temp throttle still works with dvfs off and as for battery life with dvfs on when all 4 cores get stuck online I get less with 1h and 30m on screen compared to dvfs off and also there is much more heat running with all 4 cores online so I used Note 3 with dvfs off from February till this month when I bought gs5 and had 0 issues with heat. I would also love if someone could start a petition for Samsung to disable dvfs because it causes more problems than it helps.

ciprianruse88 said:
On my previous device (Note 3) disabling dvfs through wanam xposed didn't worked (some other users tested with the same result) . Temp throttle still works with dvfs off and as for battery life with dvfs on when all 4 cores get stuck online I get less with 1h and 30m on screen compared to dvfs off and also there is much more heat running with all 4 cores online so I used Note 3 with dvfs off from February till this month when I bought gs5 and had 0 issues with heat. I would also love if someone could start a petition for Samsung to disable dvfs because it causes more problems than it helps.
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I couldn't find any specifics when I googled it, sorry, but what is DVFS intended to do? It dynamically sets the voltage depending on CPU speed to save battery or something? :S

Hellscythe said:
I couldn't find any specifics when I googled it, sorry, but what is DVFS intended to do? It dynamically sets the voltage depending on CPU speed to save battery or something? :S
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I quote: "After that DVFS is completely disabled! Kernel can handle totally the power of cpu so the up/down scaling! Cpu and Gpu freq are not blocked anymore! The cpu and gpu are used based on tasks and not limited by crap samsung behaviour".

ciprianruse88 said:
I quote: "After that DVFS is completely disabled! Kernel can handle totally the power of cpu so the up/down scaling! Cpu and Gpu freq are not blocked anymore! The cpu and gpu are used based on tasks and not limited by crap samsung behaviour".
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I remember on the galaxy S2 this was simply an app that could be disabled using most root tools! Fortunately I still get anywhere from 5-7 hours screen-on time on the S5 (brightness dependant) whether this bug is present or not. Does the cpu frequency still respond according to the governor? I noticed the S5 regularly increases the minimum cpu speed to about 1.1 Ghz (not 300 mhz). Does this behaviour remain with the mod? I'm just curious because with the great battery I'm happy to meed anything that improves smoothness.

ciprianruse88 said:
On my previous device (Note 3) disabling dvfs through wanam xposed didn't worked (some other users tested with the same result) . Temp throttle still works with dvfs off and as for battery life with dvfs on when all 4 cores get stuck online I get less with 1h and 30m on screen compared to dvfs off and also there is much more heat running with all 4 cores online so I used Note 3 with dvfs off from February till this month when I bought gs5 and had 0 issues with heat. I would also love if someone could start a petition for Samsung to disable dvfs because it causes more problems than it helps.
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so what app do you use to disabla DVFS ? are there others than xposed module (by wanam) ?

Has anyone noticed a difference on the new Lollipop firmware for either the S5 or the Note 3? Does this issue persist? All the 4.4.2 builds on my S5 seem to have this!

Any updates on this issue?
Is it actually SAFE to do this, as long as you are not Overclocking? Also, does this option in Wanam's Xposed module work for this now? Or still no?

Pikaberdot said:
Any updates on this issue?
Is it actually SAFE to do this, as long as you are not Overclocking? Also, does this option in Wanam's Xposed module work for this now? Or still no?
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I have seen no further updates and as far as I know it is safe, it simply transfers control from Samsung code to Qualcomm code. However, the Samsung thresholds for thermal throttling were lower which means that they can be seen as more 'protective' at the expense of reduced performance. I use "CPU Stats" in the notification bar to monitor the issue of cores not sleeping (and general CPU usage) but as far as I know there is no official fix available yet. I am also not sure about the Xposed module, did they say there was an update fixing it?

Is there any way to improve the battery management on mi a2?

Anything is valid. Preferentially without root.

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wquayson said:
Anything is valid. Preferentially without root.
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What is your current battery performance? Is your device affected with the fingerprint sensor bug that locks the CPU at highest frequency?

kandarpjha said:
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What is your current battery performance? Is your device affected with the fingerprint sensor bug that locks the CPU at highest frequency?
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About 6-8 hours in moderate-high use, I guess. I don't think it is, how can i know?

wquayson said:
About 6-8 hours in moderate-high use, I guess. I don't think it is, how can i know?
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Install a hardware monitor app like CPU-z or DevCheck. If you CPU frequency is not coming down from the highest value (for 4 small cores: 1843 MHz and for 4 big cores: 2208 MHz), you are most probably affected by the bug. You can disable fingerprint sensor to conserve battery in that case.

wquayson said:
About 6-8 hours in moderate-high use, I guess. I don't think it is, how can i know?
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If you are talking about SOT, it's quite normal.
You can't really improve SOT.
It depends mainly on two things : Brightness and Kernel settings. Kernel you cant tamper with without rooting/unlockin your phone, so the best improvement can be achieved via auto brighness.
If you are losing too much battery while phone is idle/screen locked, here are some steps you can follow:
Limit background use of an application from Settings/Battery (Even google play services, notifications still come through)
Disable background data use of apps from Data Usage (Especially facebook/messenger ones, notifications still come through via GCM - use to your own likings though)
Clear Google Play Services cache, as it somehows causes battery drain
Disable location and google location tracking
Disable "Data always on" at developer settings. No point of keeping an active connection while on WiFi
Change network to 3G Only, if your 4G coverage sucks, so it drains all your battery

kandarpjha said:
Install a hardware monitor app like CPU-z or DevCheck. If you CPU frequency is not coming down from the highest value (for 4 small cores: 1843 MHz and for 4 big cores: 2208 MHz), you are most probably affected by the bug. You can disable fingerprint sensor to conserve battery in that case.
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Click to collapse
When i quit the app and come back, the frequencys are at the maximum value for a milisecond then goes to 1401MHz(CPU 0-3) and 1113MHz(CPU 4-7). So, I don't think I have that bug. What do you say?
Reptant said:
If you are talking about SOT, it's quite normal.
You can't really improve SOT.
It depends mainly on two things : Brightness and Kernel settings. Kernel you cant tamper with without rooting/unlockin your phone, so the best improvement can be achieved via auto brighness.
If you are losing too much battery while phone is idle/screen locked, here are some steps you can follow:
Limit background use of an application from Settings/Battery (Even google play services, notifications still come through)
Disable background data use of apps from Data Usage (Especially facebook/messenger ones, notifications still come through via GCM - use to your own likings though)
Clear Google Play Services cache, as it somehows causes battery drain
Disable location and google location tracking
Disable "Data always on" at developer settings. No point of keeping an active connection while on WiFi
Change network to 3G Only, if your 4G coverage sucks, so it drains all your battery
Click to expand...
Click to collapse
Auto brightness? Really? I thought that was a battery killer. My brightness is in about 25% most of the time, so, I don't think that is the bigger problem, do you?
Well, thanks both of you guys for the help, and I will follow your instructions(but not the auto brightness one, I don't really like it), Reptant. I will try to remember and report the results at the end of the day.

wquayson said:
Auto brightness? Really? I thought that was a battery killer. My brightness is in about 25% most of the time, so, I don't think that is the bigger problem, do you?
Well, thanks both of you guys for the help, and I will follow your instructions(but not the auto brightness one, I don't really like it), Reptant. I will try to remember and report the results at the end of the day.
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Yes, that's right. Disable auto brightness, and keep the brightness at around 10%. It is more than sufficient in indoor conditions. Further, disable high accuracy location settings and set it to battery saving or off. You should also turn off WiFi and Bluetooth scanning in location settings.
I personally use a rather far reaching way of force stopping every social media and other news apps after using them (I have never observed any 'misbehavior' as they warn, but it saves a great deal of battery life.). As you can see in the screenshot the battery has lost 7% of charge in 2 hours and it still expects to last for 1 full day.

wquayson said:
When i quit the app and come back, the frequencys are at the maximum value for a milisecond then goes to 1401MHz(CPU 0-3) and 1113MHz(CPU 4-7). So, I don't think I have that bug. What do you say?
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Min freq should be 633 MHz for the little cluster,it a bug with the 2nd October update, many users are affected,and so i!
https://forum.xda-developers.com/mi-a2/help/frequency-sd660-stuck-maximum-t3832366

Hello, any better result if phone is rooted ? Or any other solution? Thanks a lot.

buythismobile said:
Hello, any better result if phone is rooted ? Or any other solution? Thanks a lot.
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The suggestions from Reptant above are still valid.
Other than that:
1. Greenify. Set non system apps to shallow hibernation. Try Amplify if you dare.
2. Disable ads. The image/video ads may not occupy a lot of your screen, but they use much more data than text. disabling those ads will reduce the amount of data that the modem needs to download, hence reduce battery consumption. this will have big impact if you surf the web a lot using phone.
3. Change CPU governor to powersave and/or disable some CPUs, reduce GPU max clock speed (you may not like this since it will make the phone laggy)

New galaxy note 4 prevent emmc issue

Is there anything I can do on a new galaxy note 4 to prevent the emmc issue happening in the first place?

There was some talk about preventing overheating?

ghostwheel said:
There was some talk about preventing overheating?
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Do I need to lower the cpu ghz? Or run some kind of app or program?

Redrainz said:
Do I need to lower the cpu ghz? Or run some kind of app or program?
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It might help to lower the CPU speed, but you need access to root and an app to tweak the values.
Avoid gaming which is very demanding on GPU and avoid gaming for long periods of time.
Search also in the Snapdragon forum a good kernel.
Also turn off the fast charging, this can heat too much the phone.

I created a script here. It works very good, it monitors the battery temperature AND all the CPU cores temperatures, and will automatically throttle the phone if temps are too high. You can even kill some apps if the temps are to high (not yet implemented).
The difference with Samsung DVFS or integrated temperature management of kernels is that this one monitors almost all CPU sensors and also the battery, all in complete combination, and it can be easily tweaked (rather than modding a kernel). No battery hog. You can enable USB fast charge, game, etc it will still prevent overheating.
Here is the solution to eMMC error
Hello everyone, I was pretty tired of the eMMC error, and I created a script that completely annihilate this error. This error is due to the phone heating up, and the fact that custom kernels (maybe even the original kernel) don't read the...
forum.xda-developers.com

Fix or tips for CPU overheating?

First of all, I'm not gaming in this phone.
Here are apps I use:
XPlayer
IDM
Reddit
CPU Monitor
Network Speed
I'm using Pixel Experience Rom Android 11
According to CPU Monitor app, my cpu is always around 58-65 celsius and it sometimes shoots up to 75-80 celsius. I live in tropical country and this phone is notorius for heating. I already opened up the back for battery replacement so I have experienced opening this phone.
Any tips to not let cpu overheat? Whether on software or hardware side?
Edit: I'm asking about managing CPU temp (not battery temp)