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[UV] Nexus 4 UV Thread - POST YOUR UNDERVOLTING RESULTS - GET A (BATTERY)LIFE :)

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By Herminator19640927, Member on 19th February 2013, 10:24 AM
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Hey Guys,


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):

Quote:

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:


Quote:
Originally Posted by kelah

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)

Greetz
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19th February 2013, 10:29 AM |#2  
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Re: Nexus 4 UV Thread
I am on the new pa ROM
Faux latest kernel

Min 384
Max 1300

UV at -150

WiFi and data use.
Screen brightness just below half .

Now on 56% battery left and been off charge for
1 day 2 hours. ..... Gimme a hell yehh....

Sent from my pie'd nexus 4
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21st February 2013, 05:36 PM |#3  
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Re: [UV] Nexus 4 UV Thread - POST YOUR UNDERVOLTING RESULTS
CM10.1

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22nd February 2013, 02:43 AM |#4  
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Re: [UV] Nexus 4 UV Thread - POST YOUR UNDERVOLTING RESULTS
Bigxie AOKP PUB build 2/15 (4.2.2)
Frankien intelli-plug kernel
Fast bin

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22nd February 2013, 05:32 AM |#5  
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Re: [UV] Nexus 4 UV Thread - POST YOUR UNDERVOLTING RESULTS
Quote:
Originally Posted by revamper

CM10.1

Sent from my Nexus 4 using Tapatalk 2

+1

Sent from my Nexus 4 using xda premium
22nd February 2013, 10:49 AM |#6  
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How do you test for different frequency stages? Stability test always runs at maximum CPU speed.
22nd February 2013, 11:04 AM |#7  
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Re: [UV] Nexus 4 UV Thread - POST YOUR UNDERVOLTING RESULTS
CM 10.1 with franco

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22nd February 2013, 11:08 AM |#8  
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384Mhz min
1024Mhz max

-150mV

Faster binned CPU


Completely stable, could probably go to at least -175mV stable... But it's okay as it is, phone is still snappy(can't even tell the difference tbh) and the battery will last me 1,5 - 2 days, which was something unseen on the iPhone 4 I had before..
22nd February 2013, 11:48 AM |#9  
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Quote:

How do you test for different frequency stages? Stability test always runs at maximum CPU speed.

You just have to choose "Scaling Stability Test (Root)" in the main menu. There you can choose which frequencies will be tested.
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22nd February 2013, 04:36 PM |#10  
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I'm really interested in undervolting but want to find out which chip I have. I tried doing the terminal emulator technique above but the sheer amount of info it pulls seems incomprehensible to me! Could someone point me in the right direction of how I find out what kind of chip I have got in here so I can start playing around with UVing? Just for reference I'm on the latest PA 3.0 ROM with Faux Kernel

Cheers
22nd February 2013, 04:41 PM |#11  
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Quote:
Originally Posted by NightflyUK

I'm really interested in undervolting but want to find out which chip I have. I tried doing the terminal emulator technique above but the sheer amount of info it pulls seems incomprehensible to me! Could someone point me in the right direction of how I find out what kind of chip I have got in here so I can start playing around with UVing? Just for reference I'm on the latest PA 3.0 ROM with Faux Kernel

Cheers

http://forum.xda-developers.com/show....php?t=2052496

You should be able to UV to at least -100mV, no matter what chip you have..
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