Undervolting Pre3

[virseph]

Hi, just wondering when these will be available in stable release? I'm very much interested to try this. Thanks.

[hagster]

I can't seem to get my voltage changes to stick. Whenever I go back into the voltage settings they have reverted to default. I'm on the latest UberKernel and can overclock to 1.9GHz fine.Running 2.2.4 on a Pre3.

Any help would be appreciated.

[kill_dano]

Are you making a new profile? You need to save changes into a profile.

Mine:
128Mhz: 800mV
245Mhz: 800mV
368Mhz: 800mV
768Mhz: 825mV
806Mhz: 850mV
1Ghz: 875mV
1.2Ghz: 950mV
1.4Ghz: 1050mV
1.5Ghz: 1125mV
1.6Ghz: 1200mV
1.8Ghz: 1250mV
1.9Ghz: 1325mV

[hagster]

yes.

I do the following

advanced settings
cpu frequencies
cpu voltage
change value e.g. 1.4 to 1249mv
swipe back
apply settings
swipe back
save as new profile

when I look at the profile details or go back to voltage settings it still says 1250mv.

do I need dev mode on or beta access to preware?

[virseph]

Originally Posted by hagster

yes.

I do the following

advanced settings
cpu frequencies
cpu voltage
change value e.g. 1.4 to 1249mv
swipe back
apply settings
swipe back
save as new profile

when I look at the profile details or go back to voltage settings it still says 1250mv.

do I need dev mode on or beta access to preware?

I noticed this as well. I think it needs to be in increments of 25 before you have to save it. E.g. 1250 change it to 1225 then apply settings. It should stick then.

[hagster]

Originally Posted by virseph

I noticed this as well. I think it needs to be in increments of 25 before you have to save it. E.g. 1250 change it to 1225 then apply settings. It should stick then.

The new Govnah app will only let me go up and down 2 notches so I can't try that.

Tried un-installing and reinstalling UberKernel but no change. (

[yellox]

Yeah, same here, and the voltage settings don't stick.
Maybe this doesn't work on 2.2.4?

Originally Posted by hagster

The new Govnah app will only let me go up and down 2 notches so I can't try that.

Tried un-installing and reinstalling UberKernel but no change. (

[ShiftyAxel]

The voltage settings stick fine for me, but the CPU will sometimes max out and remain at maximum speed (whilst being really laggy, odd) until rebooted.

[hagster]

The new version of Govnah (v1.3.8) has fixed the voltage changes not sticking problem on my Pre3 at least.

Thanks webOSInternals.

[rwhitby]

Originally Posted by hagster

The new version of Govnah (v1.3.8) has fixed the voltage changes not sticking problem on my Pre3 at least.

Thanks webOSInternals.

If you're using an alpha or beta kernel, you should always be using the corresponding alpha or beta Govnah.

-- Rod

[hagster]

Originally Posted by rwhitby

If you're using an alpha or beta kernel, you should always be using the corresponding alpha or beta Govnah.

-- Rod

I've just been using the regular feeds. If I somehow got out of sync then I don't know how.

Thanks again, Hagster )

[tomassplatch]

great article on XDA developers: In Depth Nexus S Battery Study Brings About Surprising Conclusions | xda-developers

"No gain to be had from undervolting either ARM or INT voltages. I tested this to the extreme."

I wonder if the result is applicable to our Pre 3 as well. Personnaly, I don't see any battery gain from underwolting, my pre battery life has always been fine!

[hagster]

Interesting read and the guys clearly put in a lot of effort. Still i'd be surprised if something isn't amiss in the setup. Chip makers wouldn't go to all that effort of setting different voltages for different speeds if it wasn't needed.

Looks like there are a few things need to be double checked before the result stands.

1) Effect of CPU load. ARM chips are really aggressive at turning off unused blocks when not being used.

2) Possibility that the UV settings weren't being enabled properly.