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How Ubuntu 12.04 Is Trying To Drop Power Usage

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  • #16
    Originally posted by cking View Post
    So what are is Canonical doing?

    * Crowd-sourced the testing for the PCIe ASPM ( to ensure we didn't cause regressions by including Matthew's patch in an LTS. Kudos to Matthew for this.

    * Measured all the powertop recommendations across a bunch of machines and found a common set of improvements that should not cause any regressions for an LTS and added them into pm-utils. Maybe trivial, but we wanted to ensure we didn't cause any major upsets for an LTS.

    * Worked through a list of possible power saving options suggested during UDS: - this does take time to do accurately and methodically across a range of hardware. We have a lot of details results here and the Phoronix write up is a re-working of the top level summary of this work. I hope readers examine the original source data and understand how much effort has been put into identifying the low-hanging fruit. The data can be found at: It is useful to understand the kinds of power savings possible and understand exactly where to focus attention. Some of the work was just to identify low-risk low-hanging fruit.

    * Identified applications that were sub-optimally doing wakeups and we have engineers working on fixing these right now. See - as you may appreciate some issues are not quick fixes and require engineering time and effort to address.

    For those interested, there is a Power Management Wiki page:

    These issues are on our radar and we are devoting effort to this cause. This is work in progress.

    As ever, we are always very grateful for the community help in crowd-source testing some of these fixes.
    Thanks for sharing that


    • #17
      touchpad and mouse

      It causes shitload of cpu wakeups by its nature, I don't see why that's a problem or mistery, it's not OS dependent