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Thread: Power saving in Hardy on Laptop (powertop)

  1. #1
    Join Date
    Sep 2006
    Beans
    7

    Power saving in Hardy on Laptop (powertop)

    So basically i am not having any real problem with Hardy, but the power consumption seems to have less improvement than expected.

    When I was using Gusty, the powertop always complained there is no CONFIG_NO_HZ option for the kernel (2.6.22). While I have upgraded to Hardy, I also found many options (e.g. laptop mode, etc) are not showing up...

    Here are the power usage for different OS on my thinkpad

    Hardy: 19~21W (powertop)
    Gusty: 17~19W (powertop)
    Windows Vista: 14~16W (thinkpad powermanager + undervolting)

    Overall battery life is around 3~3.5 hours

    Just wonder where does the options in the powertop goes? are they all implicitly enabled in Hardy now?

    I was expecting the new ubuntu has great improvement on battery life since using the new kernel (according to lesswatts.org). But this is not the case (yet).

  2. #2
    Join Date
    Jul 2007
    Location
    Home
    Beans
    109
    Distro
    Ubuntu 12.10 Quantal Quetzal

    Re: Power saving in Hardy on Laptop (powertop)

    Quote Originally Posted by quantumkit View Post
    So basically i am not having any real problem with Hardy, but the power consumption seems to have less improvement than expected.

    When I was using Gusty, the powertop always complained there is no CONFIG_NO_HZ option for the kernel (2.6.22). While I have upgraded to Hardy, I also found many options (e.g. laptop mode, etc) are not showing up...

    Here are the power usage for different OS on my thinkpad

    Hardy: 19~21W (powertop)
    Gusty: 17~19W (powertop)
    Windows Vista: 14~16W (thinkpad powermanager + undervolting)

    Overall battery life is around 3~3.5 hours

    Just wonder where does the options in the powertop goes? are they all implicitly enabled in Hardy now?

    I was expecting the new ubuntu has great improvement on battery life since using the new kernel (according to lesswatts.org). But this is not the case (yet).
    How do you determine how many watts you are using with powertop?
    Thanks
    Shuttle SA76G2* Athlon II X2 245 * 4Gb PC26400 * 250 Gb HDD * DVD-RW * Ubuntu 12.10

  3. #3
    Join Date
    Sep 2006
    Beans
    7

    Re: Power saving in Hardy on Laptop (powertop)

    If you are using battery, powertop will show the power consumption and the remained battery life, i.e.
    Code:
    sudo powertop

  4. #4
    Join Date
    Dec 2007
    Location
    pacific northwest
    Beans
    243
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Power saving in Hardy on Laptop (powertop)

    I believe that the Ubuntu team has implemented some of powertop's suggestions. It's also been reported (don't have the links handy) that at least a few of powertop's suggestions are bogus or irrelevant.

    I'm just getting into power optimization, but I'm finding oddly that powertop is reporting MORE cpu wakeups from idle in Hardy, yet less overall power consumption and longer times in deeper sleep states. Weird.

  5. #5
    Join Date
    Dec 2005
    Beans
    293

    Re: Power saving in Hardy on Laptop (powertop)

    Are you guys getting the usb informations from powertop?
    I dont and i dont know why.

    I also have trouble with usb (uhci_hcd), since Hardy one of my 2 cores is always in C2 unless i unload uhci_hcd manually.

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