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Thread: Energy consumption in Oneiric

  1. #1
    Join Date
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    Energy consumption in Oneiric

    Hi,

    I open this new thread because I just found a solution to the increased battery drain that I was experiencing since upgrading to Oneiric. I hope that other users eventually affected by the same problem may found this post useful.

    Consider this thread as the continuation of the original discussion in Ubuntu+1 subforum (link) that is now closed after the official release of Oneiric.

    Quick summury of old discussion:
    On my laptop, as well as some other users' laptop, Oneiric was draining battery faster than Natty. For example my battery drain increased from ~11W to ~17W while web browsing in wi-fi. (With the standard configuration, just turning off the discrete card).

    Applying some tweaks (link) I was able to reduce drain to 13-15W.. somehow better, but still worse than Natty's 11W. And moreover natty reached those 11W without the need any tweaking! Other users had improved their situation installing jupiter, but niether them were able to reach natty's drain.

    So, a solution was still to be found..
    And now my new discovery..

    At first I believed that this regression in battery drain was software related, and not kernel related.. but it turned out that I was wrong!

    I just downgraded the kernel on my oneiric to 2.6.39 (got it here) and now my laptop drains 9-11W depending on use.. Great!

    UPDATE 2011-10-15: in comment #7 tista suggested a better fix! Downgrading the kernel is no more required! we just have to pass a tweak to the standard 3.0 kernel.
    Last edited by clemmy; October 15th, 2011 at 07:32 PM.

  2. #2
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    Re: Energy consumption in Oneiric

    @clemmy,

    Thanks for your research...

    Unfortunately I didn't make huge differences by using your scripts, but anyway you should keep up the great work for it!!

    I suppose some reasons...
    * my VAIO Z (VPCZ21AJ) has Core i5 2410 as standard voltage, 1920x1080 full-HD LCD, mobile SATA RAID controller, LightPeak docking bay and some other "expensive" modules. usually in past, these modules were not tested on ubuntu properly...

    Just now I've seen the battery power "16 to 20W" averages with lowest brightness... but I didn't test downgraded kernel yet, since sandy-bridge must be run under 3.0 or higher. Although I know 3.0 series might have some issues for power saving.

    cheers.

  3. #3

    Re: Energy consumption in Oneiric

    Quote Originally Posted by clemmy View Post
    Hi,

    I open this new thread because I just found a solution to the increased battery drain that I was experiencing since upgrading to Oneiric. I hope that other users eventually affected by the same problem may found this post useful.

    Consider this thread as the continuation of the original discussion in Ubuntu+1 subforum (link) that is now closed after the official release of Oneiric.

    Quick summury of old discussion:


    And now my new discovery..

    At first I believed that this regression in battery drain was software related, and not kernel related.. but it turned out that I was wrong!

    I just downgraded the kernel on my oneiric to 2.6.39 (got it here) and now my laptop drains 9-11W depending on use.. Great!
    Sounds like you have the buggy BIOS problem.

    Go back to the new kernel, and add pcie_aspm=force as a kernel option to grub.
    [ Fuduntu.org ] - [ Fuduntu Forum ] - [ Fuduntu Blog ] - [ Fuduntu Wiki ]

    For a classic desktop with the latest apps, get Fuduntu!

  4. #4
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    Re: Energy consumption in Oneiric

    Thanks clemmy,

    I tried it:

    installed the 2.6.39 kernel and after that installed the acpi_call module to be able to disable my radeon.

    The 3.0 kernel I got down to 17W, with this 2.6.39 kernel I am now down to 13W!

    I can also see the temperature of my system has been lowered from something above 55 degrees to something below 50!

    I also tried the 3.0 kernel with the pcie_aspm=force option, but this does not lead to any lower consumption, so there probably has changed somewhat more with regard to power consumption between 2.6.39 and 3.0 except for aspm.

  5. #5
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    Re: Energy consumption in Oneiric

    Quote Originally Posted by fuduntu View Post
    Sounds like you have the buggy BIOS problem.

    Go back to the new kernel, and add pcie_aspm=force as a kernel option to grub.
    No, I had already tested that, my BIOS is not affected.. so forcing aspm does not help.

    Moreover, if I'm not wrong, laptops with buggy pcie aspm should have increased drain starting with 2.6.38 kernel.. In my laptop battery drains begins with 3.0 kernel, both 2.6.38 and 2.6.39 are ok.


    BTW, I've just tried out fuduntu, but I have the same splitted screen problem as lvanderree

  6. #6

    Re: Energy consumption in Oneiric

    Quote Originally Posted by clemmy View Post
    No, I had already tested that, my BIOS is not affected.. so forcing aspm does not help.

    Moreover, if I'm not wrong, laptops with buggy pcie aspm should have increased drain starting with 2.6.38 kernel.. In my laptop battery drains begins with 3.0 kernel, both 2.6.38 and 2.6.39 are ok.


    BTW, I've just tried out fuduntu, but I have the same splitted screen problem as lvanderree
    There is a new version of xorg in our unstable repository.
    [ Fuduntu.org ] - [ Fuduntu Forum ] - [ Fuduntu Blog ] - [ Fuduntu Wiki ]

    For a classic desktop with the latest apps, get Fuduntu!

  7. #7
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    Re: Energy consumption in Oneiric

    Guys,

    If you guys have any "Sandy-bridge" i915 gen6, please give it a try:
    Code:
    i915.i915_enable_rc6=1
    You could put it into your kernel parameters on grub...

    I could fix the power consumptions on battery from 20W to 10W!!
    Today I didn't think we had to rollback kernel to 2.6.39 on sandy-bridge anymore.

    cheers.

  8. #8
    Join Date
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    Ubuntu 11.04 Natty Narwhal

    Re: Energy consumption in Oneiric

    EXCELLENT!!!!!


    I am now running 3.0 as well, with this kernel option and power consumption is somewhere around 10W

    or according to powertop --calibrate outcome, it has changed from
    16.7 t0 9,5W!!!!

    Score: 5,6 (192371,1)
    Guess: 16,7
    Actual: 9,5


    I tried all kind of distro's, like Mint, Arch, OpenSuse, Fedora, Fubuntu, but only Mint got close to an acceptable power consumpution, but nothing works as nice as Ubuntu, with the debian-package system and stable packages (or at least more stable than Mint)!

    I was already thinking about using Windows again. I would of course run Ubuntu in a VM, but after more than 6 years of happily using Ubuntu and other Linux variants without Windows, this was a real painful moment!

    This solution definitely makes my day (or actually week, no month...s )

    How did you find this solution?

  9. #9
    aeronutt is offline Grande Half-n-Half Cinnamon Ubuntu
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    Re: Energy consumption in Oneiric

    Quote Originally Posted by tista View Post
    Guys,

    If you guys have any "Sandy-bridge" i915 gen6, please give it a try:
    Code:
    i915.i915_enable_rc6=1
    You could put it into your kernel parameters on grub...

    I could fix the power consumptions on battery from 20W to 10W!!
    Today I didn't think we had to rollback kernel to 2.6.39 on sandy-bridge anymore.

    cheers.
    How do I discover which gen SandyBridge I have? (Or, does this work for only gen6?)

  10. #10
    aeronutt is offline Grande Half-n-Half Cinnamon Ubuntu
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    Re: Energy consumption in Oneiric

    Quote Originally Posted by tista View Post
    ... but I didn't test downgraded kernel yet, since sandy-bridge must be run under 3.0 or higher. ...
    I'm running SB (i3) on a 2.x kernel (11.04) just fine.

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