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Root Undervolted kernels and ROM compatibility

S

subsist

Newbie
Do undervolted kernels save battery and cpu wear? I an interested in undervolting my kernel but I an unsure of the process involved. Do CM7 ROMs include a new kernel or does this need to be installed in recovery? My current ROM is cyanogenmod7 (gsm s-off desire, pvt 3, hboot 0.93) and my kernel is 2.6.37.4-cyanogenmod-82245-g7f230e8. Any tips, pointers or general kernel knowledge would be of great interest to me, particularly compatibility and installation info a well a benefits and risks (I can't seem to find any negatives)
 
All ROM's come with there own kernel but getting a kernel that supports undervolting will save you battery yes. I recommend ManU Kernels... others probably would to. Check out the thread HERE

Also i find the best settings for your CPU are:

HAVS-AXI-CFS
Standard profile: 245-1113mhz
Screen Off: 128-245mhz

Just for reference, thats using SetCPU. Just make sure you get the right one for your ROM.
 
CdTDroiD said:
All ROM's come with there own kernel but getting a kernel that supports undervolting will save you battery yes. I recommend ManU Kernels... others probably would to. Check out the thread HERE

Also i find the best settings for your CPU are:

HAVS-AXI-CFS
Standard profile: 245-1113mhz
Screen Off: 128-245mhz

Just for reference, thats using SetCPU. Just make sure you get the right one for your ROM.
Click to expand...

Thanks, do you know if CM7 is a gingerbread ROM? I'm not sure what file I should be downloading from your link. Also, does it make a difference that my current kernel is 2.6.37.4 rather than 2.6.35.8 or 2.6.35.13 as in the linked thread?

Thanks for you CPU setting recommendations; I'm sure they will come in handy.

Also @ Hadron and SUroot

I have read in other forums that the CM7 kernel is not undervolted as standard so I am unsure who to believe, though you guys have certainly been reliable in the past. The posts tend to be quite old (late 2010 and early 2011)

I am able to over/underclock in the CM7 settings but I have noticed the memory/sim card area becomes very warm when I overclock, particularly while charging. I know this is not a valid indicator of whether I am using the HTC standard voltage but the warmth is quite worrying and suggests an excessive use of power.
 
Hmm, yes, I have found a similar statement in the CM forums. If so they must be about the only custom kernel that isn't undervolted!

2.6.37 is, as you would guess, newer than 2.6.35. Might possibly be slightly faster, but most people say that 2.6.35 is more power efficient (which is why the ManU kernels and the Oxygen kernel are based on 2.6.35).
 
Ah but, CM7 make roms across a plethora of devices. Compare a CM kernel against any other AOSP kernel, perhaps its not undervolted, but to we who have HTC's over-generous voltage supply in our default Kernels, you would consider any AOSP kernel to be undervolted in comparison.

Well this is my thought on it, would need to see both voltage tables to confirm this though
 
SUroot said:
we who have HTC's over-generous voltage supply in our default Kernels, you would consider any AOSP kernel to be undervolted in comparison.
Click to expand...

The stock rom on the Desire S has a very lean burn so HTC seem t have addressed that issue. :D

SUroot said:
Yes and.I've told him this before ;)
Click to expand...

Yes I remember bein tole of this. :D

I was merely tryin to make a point to the OP that 128 obviously sounds better than 245 when your talkin undervoltin, but it practice it ain't always the the bestest choice. :p
 
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