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Thread: Reducing power consumption - Macbook Air 2010

  1. #1
    Join Date
    Dec 2012
    Beans
    4

    Reducing power consumption - Macbook Air 2010

    I have Xubuntu installed on a late 2010 Macbook Air (Core 2 Duo + Nvidia 320m GPU). I'm trying to find ways to reduce power consumption, aiming for under 10w when idling.

    So far, I've:

    - Installed laptop-mode-tools
    - Turned off bluetooth
    - Reduced the minimum brightness level on the display

    However, even after this battery life is quite poor. The output from powertop shows:

    Code:
    The battery reports a discharge rate of 11.5 W
    The estimated remaining time is 3 hours, 25 minutes
    
    Summary: 213.9 wakeups/second,  0.0 GPU ops/seconds, 0.0 VFS ops/sec and 5.2% CPU
    
                    Usage       Events/s    Category       Description
                100.0%                      Device         Audio codec hwC0D4: Nvidia
                100.0%                      Device         Audio codec hwC0D0: Cirrus
                100.0%                      Device         Audio codec hwC0D3: Nvidia
                100.0%                      Device         Audio codec hwC0D5: Nvidia
                  3.0%                      Device         Display backlight
                 20.2 ms/s     145.5        Process        /usr/lib/firefox/firefox
                 14.0 ms/s      10.3        Process        /usr/bin/X :0 -core -auth
                  3.5 ms/s      20.9        Timer          hrtimer_wakeup
                  2.7 ms/s      0.00        Interrupt      [0] timer/0
                  1.8 ms/s       4.4        Interrupt      [17] ohci_hcd:usb3
                  1.6 ms/s       3.2        Timer          tick_sched_timer
                  1.4 ms/s      24.8        Process        powertop
                  1.0 ms/s      0.00        Interrupt      [1] timer(softirq)
                  1.0 ms/s      0.00        kWork          do_dbs_timer
    I would appreciate any help in identifying things I can get rid of to improve my battery life...

  2. #2
    Join Date
    Oct 2007
    Beans
    338

    Re: Reducing power consumption - Macbook Air 2010

    You may also look into CPU throttling. Heres a link with lots more that maybe helpful.
    http://ubuntuforums.org/showthread.php?t=729644

    Chad

  3. #3
    Join Date
    Oct 2006
    Location
    Ayrshire
    Beans
    40,016
    Distro
    Ubuntu Development Release

    Re: Reducing power consumption - Macbook Air 2010

    Thread moved to the "Apple Users" forum.

  4. #4
    Join Date
    Jul 2011
    Beans
    3,037
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Reducing power consumption - Macbook Air 2010

    Since you are already using powertop, are there any suggestions from this tool? If yes, it may be worth posting them.

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