I read alot about OCing your Phone and Overvolting, but how about Undervolting? I thought I’ll open a new thread for discussing the UV potential of our Nexus and to show other users that they can achieve better batterylife by UVing. If you want to, please provide which chip you've got (slow, nominal, fast, faster) which ROM/kernel you are on and which voltage you’ve set on each state (use Trickster or similar apps. I recommend System Tuner Pro. You can save your stable UV settings and easily apply them again after a ROM/Kernel update).
Use this code to figure out which chip you've got (the result will either be slow - faster or numbers from 1 - 4):
1.) Install Terminal Emulator
2.) Type in su and press enter
2.) Reboot your phone
3.) Open Terminal Emulator and type:
su (press enter)
dmesg | grep PVS (press enter again)
I have a "FAST" chip and I’m on PA 3+ with latest _m+ kernel (motley kernel continued).
My voltages so far (StabilityTest stable):
192 MHz - 625,0 mV
304 MHz - 650,0 mV
486 MHz - 675,0 mV
594 MHz - 700,0 mV
702 MHz - 737,5 mV
810 MHz - 775,0 mV
918 MHz - 800,0 mV
1,02 GHz - 825,0 mV
1,13 GHz - 850,5 mV
1,24 GHz - 875,0 mV
1,29 GHz - 900,0 mV
1,35 GHz - 910,0 mV
1,40 GHz - 925,0 mV
1,45 GHz - 940,0 mV
1,51 GHz - 950,0 mV
Attention! Some users reported glitches/artifacts when going under a certain Voltage-level. So don't just test your settings with StabilityTest, take some pictures and or videos as well
Here is a post I consider to be very useful. Please read it:
I think google/LG messed up with voltages in more ways it looks on the first glance.
Put their values on the graph and You'll notice that the line is linear. But it should be somewhat parabolic.
It's easy to demonstrate on the graph.
Blue line - stock google voltages.
Red line - this I get when I set UV -150 (I can't go lower it).
Violet line - my stable setup.
As you can see my stable setup is parabolic. And in the center difference is big - 225mV at 1188mHz and 200mV at 1026mHz. For other values it ranges from 25 to 35.
Green line consist of values crashes device immediatly - I set them and right after I tap on "apply" my lovely N4 rebooting. The point is what between them and stable values 50mV. If difference abot 5-25 device works but it reboot for sure in half of hour or something like that. This is the easy way to determine how much UV you can - just find values of instant crash and rise them about 40-50mV. These values are easy to find - no need to run long tests. Would be better to do nandroid before - many repeatedly sporadic reboots can corrupt some of your data.
My surrent setup:
384 - 700 (-150)
486 - 700 (-175)
594 - 720 (-180)
702 - 740 (-185)
1026 - 825 (-200)
1188 - 875 (-225)
1350 - 940 (-185)
1512 - 1000 (-150)