For those who are having erratic batter percentage!!

[rydj]

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

 

[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!!

 

[papampi]

This was alleviated by undervolting and decreasing maximum gpu freq.

I hope this helps someone regards.

Rydj

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)