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Thread: Linux Kernel 3.0 Battery Life/Power Consumption

  1. #91
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    Dec 2010
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    italy
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    Ubuntu 10.10 Maverick Meerkat

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    okay. at this point someone (all of you who have this issues) should post a bug report at bugs.launchpad.net
    the orthographic errors i usually type are always intentionall
    http://xkcd.com/627/
    no scrolling with synaptics/alps touchpad? have a look HERE

  2. #92
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    I have tried multiple times to report a bug, but can't. All I can find is this USELESS guide: https://help.ubuntu.com/community/ReportingBugs

    Is this seriously the ONLY way to report a bug? I can't just fill out a form somewhere without running software to do it? When I try to do it the way explained in the guide, it tells me that I'm using a stable version of Xubuntu, and that only people running dev versions (like 11.10) can report bugs. Wtf?

  3. #93
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Well, I fired an email off to the Linux kernel developers mailing list, since this seems to be a kernel bug. That seems to be a pretty direct route of attack. I'd still like to file the bug in LaunchPad though, so if anyone has advice on how to do that (read my post directly above this one to see the problems I ran into), I'm all ears.

  4. #94
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    Ubuntu 10.10 Maverick Meerkat

    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    honestly that guide sounds a little too long.

    1. register to launchpad.net
    2. go here https://bugs.launchpad.net/ubuntu/+s...linux/+filebug
    3. read and fill the form:

    In what package did you find this bug? --> linux-image-3.0-0-generic

    Further information: --> your problem. include the link to this discussion.
    this one link (http://ubuntuforums.org/showthread.php?t=1822629)

    Extra options: attach what's needed.



    notice that you can use ubuntu-bug linux to ease the process but first uninstall my kernel or you'll see this message:
    Code:
    The problem cannot be reported:
    
    This is not a genuine Ubuntu package
    followed by the name of the core package you installed manually.
    the orthographic errors i usually type are always intentionall
    http://xkcd.com/627/
    no scrolling with synaptics/alps touchpad? have a look HERE

  5. #95
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Thank you! I knew there must have been a simple form somewhere! I'll file the bug report in the next 24 hours. Also, the Linux kernel team (via kernel.org) is actually already communicating with me via email. Apparently they think this really may be a genuine, new bug in the kernel, as we suspected.

    Progress!

  6. #96
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    It appears that Phoronix has also found our bug! They mention that it specifically affects Sandy Bridge laptops.

    "Besides the new Linux 3.1 kernel power regression, there's also a power regression introduced in the Linux 3.0 kernel that has previously not been talked about on Phoronix. The Linux 3.0 power draw is up by 24% over the Linux 2.6.39 kernel."

    http://www.phoronix.com/scan.php?pag..._regress&num=1

    Although they offer no solution yet, it is very encouraging to see that others have noticed our (apparently) exact same problem.

    EDIT: Haven't tried these yet, but here are some other suggested tweaks: http://www.phoronix.com/scan.php?pag...15_power&num=1
    Last edited by steevven1; August 24th, 2011 at 05:50 PM. Reason: added last link

  7. #97
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Okay, I tried the Phoronix tweaks with sbraz's nosparseirq kernel. Here were the results:

    i915.i915_enable_rc6=1 - No/negligible effect

    i915.i915_enable_fbc=1 - No/negligible effect

    i915.lvds_downclock=1 - No/negligible effect
    Last edited by steevven1; August 29th, 2011 at 07:27 PM. Reason: mistake

  8. #98
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Launchpad bug report: https://bugs.launchpad.net/ubuntu/+bug/834037

    If you could all click on "Does this bug affect you?" and register that it affects you, that would be great. Thanks.
    Last edited by steevven1; August 25th, 2011 at 08:28 PM. Reason: added sentence

  9. #99
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    I made a mistake previously and would like to clear it up. The mistake was a result of not giving something enough time and testing. I have now tested it more thoroughly and have more to report:

    Using the modified (no sparse irq) kernel with kernel parameter i915.i915_enable_rc6=1 DOES increase battery life compared to without that kernel parameter. The only problem is that it also brings back the graphical glitches and freezes, which were the ONLY reason I wanted to switch to kernel 3.x in the first place. Thus, that kernel parameter in concert with disabling sparse irq in the kernel solves the power problem (completely or almost completely), but the i915.i915_enable_rc6=1 kernel parameter brings back the glitchy graphics from kernel 2.6.x.

  10. #100
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    Re: Linux Kernel 3.0 Battery Life/Power Consumption

    Has anyone compared ubuntu-11.10 power consumption to windows-7?

    I've read a lot about how ubuntu keeps gaining power regressions with new kernel releases. How Natty (and now Oneiric) runs hot and uses lots of power. But I read this report at Phoronix (http://www.phoronix.com/scan.php?pag...untu_pow&num=1) and ubuntu looked pretty much even with Windows-7 except for some of the video playback.

    Having some sort of standard to compare this increased Sandy Bridge power use to would help me understand how severe the issue is. I was planning on running ubuntu-11.10 on a new Lenovo X220. But the X220 will be used on the road and battery life is extremely important so I might need to use Windows-7 for the time being depending on how bad the issue is when compared to windows-7.

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