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Root Relationship between kernel voltage and CPU temps?

Discussion in 'Android Devices' started by imjehh, Mar 1, 2011.

  1. imjehh

    imjehh Well-Known Member
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    It might be a dumb question, but would a Ultra low voltage kernel yield lower CPU temps than a medium voltage kernel, when texting/surfing the web?

    I constantly go up to about 90F from a 75F idle, when only sending a few texts. Im wondering if it has something to do with the voltage of the kernel, because my ultimate goal is to run a cool CPU/battery temp. Any info or suggestions would be great
     

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  2. johnlgalt

    johnlgalt Antidisestablishmentarian
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    Theoretically, yes.

    In practice, YMMV. I've always had better results with LV vs ULV kernels for some odd reason, although now, on CM7 nightly builds, I am forcing my DROID to run at 1000 MHz at a vsel=60 (whereas 'stock' is vsel=74, IIRC) using the Milestone Overclock app (since I am on CM7 nightly, using a default kernel, I have to use the modified MSOC by prime). It is a bit cooler than previously, but if I try a similar value differential / percentage differential on other clocks (1100, 800) my phone will not boot.

    So, I suppose that the hardware itself may also play a factor.
     
  3. imjehh

    imjehh Well-Known Member
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    ^thanks. I still have a lot to learn about the root/ROM world, because a lot of that was foreign haha :) but your main points so make sense, hardware has a lot to do with it. Ill keep trying uLv and Lv kernels to see which yields the lowest temps. Thanks again for giving me motivation!
     
  4. johnlgalt

    johnlgalt Antidisestablishmentarian
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    Believe it or not, I am pretty positive that I asked the very same question about a year ago, just a few months after rooting my own DROID. I could never get the original generation ULV kernels to work, and I found that when I finally found a few sets that would, that the temps were barely different, the battery was barely different....so I stuck with the tried, tested and true Chevy's 1200 MHz LV kernels for a long time on Eclair.

    Froyo brought enough UI improvements that I dropped to 100 again, then to 1000, and I've stayed at 1000 since.
     
  5. imjehh

    imjehh Well-Known Member
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    True, its good to know the questions i have arent too dumb then lol

    I think i have similar results, if not higher temps on uLv. When i text/surf the web on uLv, the temps seem to climb faster and higher than on a Lv. Im thinking maybe not enough power is being supplied from the battery to the CPU? I really dont know, just a guess. Maybe its under-powering the phone. Either way, i found a Lv kernel that i like, so ill stick with it a while and keep an eye on temps.

    When texting/surfing, my temps usually are at 89F-95F, do you see similar temps? I may be just worrying too much, but if you can let me know what a good temp to stay around is (in your opinion, i already googled this topic but havent got a general consensus) thatd be great!
     
  6. imjehh

    imjehh Well-Known Member
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    Is it possible a uLv kernel yields higher CPU temps when texting/web, than a Lv kernel when doing the same activities?
     
  7. The_Chief

    The_Chief Accept no imitations!
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    Why would it? Ultra-low voltages by nature produce less power, ergo less heat. If your Droid will run on ULV kernels, by all means, use them :)
     
  8. imjehh

    imjehh Well-Known Member
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    Seemed to me my droid had higher cpu temps with a uLv kernel than with a Lv..maybe it was just me, ill try the uLv again, now you have me wondering if it was just in my head lol
     

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