Undervolting results

[neustadt]

Hi

so what are your undervolting results of your S4 Mini?

A quick test allowed me to go -200mv. (crashed at -225mv). Now I am running StabilityTest at -150mv @ 1728 MHz (performance governor), while charging and wrapped into a winter pullover
30 minutes have passed and still running. I guess I will go up to 2 hours before lowering to -175.

I wonder if you have big undervolt differences between lower and higher frequencies?

 

[Flatric]

Hi

so what are your undervolting results of your S4 Mini?

A quick test allowed me to go -200mv. (crashed at -225mv). Now I am running StabilityTest at -150mv @ 1728 MHz (performance governor), while charging and wrapped into a winter pullover
30 minutes have passed and still running. I guess I will go up to 2 hours before lowering to -175.

I wonder if you have big undervolt differences between lower and higher frequencies?

Did you set difference voltages for every frequenzy or did you use the two buttons at the top and lower every voltage the same? My device crashes if i go -200. My max freq. is 1566 and my min. freq. is 162. As governor I use smartmax and I/O scheduler is fiops I also underclocked my Gpu to 192 Mhz.

 

[neustadt]

Not yet. I want to find a working global value and then tweak at 162MHz and 700MHz.

Did you limit your max frequency at 1566?

 

[neustadt]

I also underclocked my Gpu to 192 Mhz.

What app did you use for that?

 

[Flatric]

What app did you use for that?

Yes I limtited it at 1566, I used also Kernel tweaker to underclock my Gpu

 

[neustadt]

Yes I limtited it at 1566, I used also Kernel tweaker to underclock my Gpu

Oh, ok. So you limited your max gpu clock. Maybe I will try this out as well. But I would need to find out how far I can go down. Usually I dont play any games so I probably dont need the highest clocks on my gpu. But I do watch the occasional HD video.
In the end it might not help save batterylife, if my GPU doesnt clock that high anyways.
I would rather like to adjust the different speedsteps of the gpu just like on the cpu. ExTweaks looked processing, but doesnt seem to work with f4ktion kernel.

 

[Flatric]

Oh, ok. So you limited your max gpu clock. Maybe I will try this out as well. But I would need to find out how far I can go down. Usually I dont play any games so I probably dont need the highest clocks on my gpu. But I do watch the occasional HD video.
In the end it might not help save batterylife, if my GPU doesnt clock that high anyways.
I would rather like to adjust the different speedsteps of the gpu just like on the cpu. ExTweaks looked processing, but doesnt seem to work with f4ktion kernel.

Please tell me your result if you finished

 

[jake3317]

Hi

so what are your undervolting results of your S4 Mini?

A quick test allowed me to go -200mv. (crashed at -225mv). Now I am running StabilityTest at -150mv @ 1728 MHz (performance governor), while charging and wrapped into a winter pullover
30 minutes have passed and still running. I guess I will go up to 2 hours before lowering to -175.

I wonder if you have big undervolt differences between lower and higher frequencies?

I don't understand what you are trying to prove with wrapping your device in a winter pullover while undervolting.

When I have to apply tests at my job for simulating mobile applications, we undervolt (the solenoid of a valve) -30% and do test at very low temperature of -25'C. Then we overvolt with 30% and run '100% duty cycle' test at high temperature of +70'C. At low temperature there is a chance of not reacting anymore, at high temperature it is the latter: the coil could be toast since it can't radiate all the generated heat away.

With the undervolt test, you should put your phone in the fridge or freezer to really seeing it's behaviour at extreme circumstances. In my opinion you are now easing the pain on your phone during undervolting, by heating it from 2 sides, by charging and heat insulating it.

 

[neustadt]

I don't understand what you are trying to prove with wrapping your device in a winter pullover while undervolting.

When I have to apply tests at my job for simulating mobile applications, we undervolt (the solenoid of a valve) -30% and do test at very low temperature of -25'C. Then we overvolt with 30% and run '100% duty cycle' test at high temperature of +70'C. At low temperature there is a chance of not reacting anymore, at high temperature it is the latter: the coil could be toast since it can't radiate all the generated heat away.

With the undervolt test, you should put your phone in the fridge or freezer to really seeing it's behaviour at extreme circumstances. In my opinion you are now easing the pain on your phone during undervolting, by heating it from 2 sides, by charging and heat insulating it.

Thanks for the info. I tried to apply what I knew about desktop CPUs and overclocking/undervolting to smarphones. Since people cant put their desktop machines into a freezer this was new to me.

I think I found my final settings now and attached them as a screenshots. Its really convinient to apply different voltages to different frequencies. If I look at my last 48 hours of regular usage (it was the weekend and I went biking with gps and stuff) I have still 55% deep sleep state and 30% 162MHz. So this state is clearly the most important for battery saving.

I found that google maps navigation is a good real life test for undervolting. It crashed my device once, where i didnt have any issues going through a scaled stability test. this is a nice feature of the StabilityTest app, where the the test goes periodically through all selected frequencies. Maybe the crash was also related to jake3317 comment, as I was outside at 10° C / 50° F. Anyways I gave the cpu a little more juice on the higher frequencies and I hadn't had a crash since then.

 

[Whosat]

I've been trying to undervolt my phone using SetCpu but nothing seems to work and my phone has recently started to have huge battery drain issues.

May I know the app you guys use to set voltages for your phone? And also to test for the stability of your phone after the voltage changes?

 

[DerekZool]

You can use Kernel Tweaker for adjustments and StabilityTest for testing.

 

[Flatric]

I've been trying to undervolt my phone using SetCpu but nothing seems to work and my phone has recently started to have huge battery drain issues.

May I know the app you guys use to set voltages for your phone? And also to test for the stability of your phone after the voltage changes?

I use the App "Kernel Tweaker" https://play.google.com/store/apps/details?id=com.dsht.kerneltweaker

 

[Whosat]

Ah, finally a decent app that doesn't crash out of nowhere. I've spent the last night trying to undervolt using Kernel Tweaker and tested using the stability test.

Unstable at -200mV, rebooting after almost 2 hours. Gonna try -150mV now

Update: -150mV was stable up to 41mins where I had to stop the test as I had to leave for work. Will continue testing tonight

Update 2: -175mV & -150mV unstable, crashing and rebooting randomly. Running -125mV now

 

[neustadt]

Ah, finally a decent app that doesn't crash out of nowhere. I've spent the last night trying to undervolt using Kernel Tweaker and tested using the stability test.

Unstable at -200mV, rebooting after almost 2 hours. Gonna try -150mV now

Update: -150mV was stable up to 41mins where I had to stop the test as I had to leave for work. Will continue testing tonight

Update 2: -175mV & -150mV unstable, crashing and rebooting randomly. Running -125mV now

If you found a stable base voltage you can do two more things: 1st. lower your minimum cpu clock to 162MHz. 2nd lower the voltage of this frequency alone a little more. for me it can take 50mv less then my base voltage. and its my most used clock besides deep sleep.

 

[Whosat]

Will keep that in mind. I'm still randomly rebooting at -125mV.. Bringing it up to -100mV. Hopefully it'll be stable at this voltage!

 

[spanish33]

Will keep that in mind. I'm still randomly rebooting at -125mV.. Bringing it up to -100mV. Hopefully it'll be stable at this voltage!

Thanks please keep us updated on results. Will use it as a base.

Sent from my GT-I8190 using xda app-developers app

 

[Whosat]

It may be worthy to note that every device has different undervolting potentials so you should experiment on your own too!

But I'll keep posted here

 

[Whosat]

Have yet to run a full stability test but I've had a pretty stable day of using the phone at -100mV.

Will probably test while plugged in tonight when I find a reliable power source

 

[Whosat]

So I've got a steady 5 hour stability test going at -100mV, with the exception of 1728 set at -115mV and 162 set at -125mV.

I've now decreased an additional 10mV across the board to see how it goes for the next 5 hours.

I'm also now using the Trickster MOD kernel app instead of the open source kernel tweaker app as I found that the open source version sometimes does not set my settings at boot (Min/Max frequencies to be exact). And the trickster mod app has the bonus of being able to control fauxsound

 

[ExiLeX420]

So I've got a steady 5 hour stability test going at -100mV, with the exception of 1728 set at -115mV and 162 set at -125mV.

I've now decreased an additional 10mV across the board to see how it goes for the next 5 hours.

I'm also now using the Trickster MOD kernel app instead of the open source kernel tweaker app as I found that the open source version sometimes does not set my settings at boot (Min/Max frequencies to be exact). And the trickster mod app has the bonus of being able to control fauxsound

Awesome im interested to see your final results in undervolting im looking to get some more battery power