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Thread: Linux Kernel 3.0 Battery Life/Power Consumption

  1. #231
    Join Date
    Aug 2010
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    206

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    FROM THE WRITER OF THE PATCH...PLEASE HELP HER OUT:

    "
    Hi Everyone,
    I see some of you have found the RC6 tunables test kernel I built. As a follow on to that I've been in touch with upstream and have pulled in a proposed patch which disables RC6p (deep RC6) for Sandy Bridge. Upstream claims that RC6p is what was responsible for the reports of hangs/graphics corruption issues when RC6 was enabled. I've then added a follow on patch to then enable plain RC6 by default for Sandy Bridge users. Both of these patches are available in the latest 3.2.0-17.26 kernel.
    In order to help justify keeping these patches applied and providing Sandy Bridge users improved power savings by default (ie users will no longer need to pass in i915.i915_enable_rc6=1), I'd really appreciate if you could all review my call for testing which I posted to both the Ubuntu kernel-team and ubuntu-devel mailing lists:
    https://lists.ubuntu.com/archives/ke...ry/019029.html
    If you could please test and provide your feedback on the PowerManagementRC6 wiki, I would greatly appreciate it.
    https://wiki.ubuntu.com/Kernel/PowerManagementRC6
    Thanks in advance."

  2. #232
    Join Date
    Aug 2010
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    206

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Potentially bad news: I started experiencing freezes again on my X220 with RC6 enabled and the new (tunable RC6) kernel. The freezes only occur (so far) while using LibreOffice Calc, but they are exactly the same types of freezes I have experienced with RC6 before. I have not yet seen the graphical glitches appear as they used to, so that's good news at least. I can't be 100% sure these freezes are related to RC6 and not to LibreOffice Calc, so I'll keep testing, but I suspect that they may be linked to RC6 since I never had a problem with Calc before. I will report back. I would recommend that anyone testing RC6 should use their computer extensively for several days before reporting anything.

  3. #233
    Join Date
    Nov 2004
    Beans
    7

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    I've got the same problem with LibreOffice Calc.
    Disabling Hardware acceleration and anti-aliasing in Tools/options/Libreoffice/view fixes the problem.

  4. #234
    Join Date
    Oct 2010
    Beans
    66

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Code:
    sudo gedit /etc/default/grub
    
      Search for this line:
      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    
      Replace the above line with this one and save the file:
      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force"
    
      Update the Grub by using this command:
      sudo update-grub
    I found this possible solution on maketecheasier.com
    Does it work, or the battery power consumption is still a problem to solve?

  5. #235
    Join Date
    Aug 2010
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    206

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Quote Originally Posted by Bromden View Post
    Code:
    sudo gedit /etc/default/grub
    
      Search for this line:
      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    
      Replace the above line with this one and save the file:
      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force"
    
      Update the Grub by using this command:
      sudo update-grub
    I found this possible solution on maketecheasier.com
    Does it work, or the battery power consumption is still a problem to solve?

    That is the solution to an entirely different problem.

  6. #236
    Join Date
    Aug 2010
    Beans
    206

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    The Sandy Bridge power issue is solved, and the patch is applied to the Ubuntu 12.04 (Precise) kernel, and RC6 is enabled by default with this kernel, so no kernel parameters are required, etc.

    As for the LibreOffice issue, it seems unrelated to the power issues. There is a bug report for that here: https://bugs.launchpad.net/ubuntu/+s...ux/+bug/940771

    Marking this thread as SOLVED!


  7. #237
    Join Date
    Aug 2011
    Beans
    7

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Quote Originally Posted by steevven1 View Post
    That is the solution to an entirely different problem.
    Can you explain this please? From my reading, setting the boot parameter "pcie_aspm=force" effectively does the same thing (although not as permanently) as the kernel patch, right?

    EDIT: oops, i am confusing the RC6 patch for the ASPM patch, my bad!
    Last edited by danls; March 22nd, 2012 at 02:44 PM.

  8. #238
    Join Date
    Aug 2009
    Beans
    4

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Hoi,

    so what kind of power consuption should I see for my t420s, i7 2640M?

    Currently I see around 25W after implementing the "GRUB_CMDLINE_LINUX_DEFAULT="i915.i915_enable_rc6= 1 pcie_aspm=force acpi=noirq quiet splash" "

    But the thinkpad last only 1.5hours on battery however my fan issue is still not resolved.

    thanks
    peter

    Quote Originally Posted by steevven1 View Post
    The Sandy Bridge power issue is solved, and the patch is applied to the Ubuntu 12.04 (Precise) kernel, and RC6 is enabled by default with this kernel, so no kernel parameters are required, etc.

    As for the LibreOffice issue, it seems unrelated to the power issues. There is a bug report for that here: https://bugs.launchpad.net/ubuntu/+s...ux/+bug/940771

    Marking this thread as SOLVED!


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