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Thread: OS 11.1 running 3 different power modules

  1. #1
    Griobhtha NNTP User

    Default OS 11.1 running 3 different power modules


    I updated to OS 11.1 from OS 11.0 (running KDE 4.xx). After updating,
    and noticing inconsistencies with monitor standby,etc..., I noticed that
    3 different power modules are all running with different settings,

    1) KPowerSave is running (as it was under OS 11.0) with one set of
    times for power saving functions.

    2) Under Configure Desktop -> Display -> Power Control, is another (and
    different) set of times for power saving functions (for the same
    functions as the other two modules).

    3) Under Configure Desktop -> Advanced -> Power Management, is another
    (and different) set of times for power saving functions (for the same
    functions as the other two modules). This is the "PowerDevil" module
    which also runs an underlying service module.

    What are the pros and cons to each of these (a comparison)? Why are
    all three loaded and running by default? I've disabled KPowerSave and
    am trying to determine whether to turn off PowerDevil or the the other
    module under Display.

    Thanks


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    Griobhtha
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  2. #2
    marccarney NNTP User

    Default Re: OS 11.1 running 3 different power modules


    I've also noticed that I have numerous different ways to alter my power
    settings. I'm thinking of reducing this to a sinle agent, poehaps
    KPowersave? Which one I don't know yet. But I'm also having problems
    with 'suspend'. Suspend to disk won't work at all and comes up with an
    error message. Suspend to ram sometimes behaves a bit odd. I'd welcome
    any input into this problem.


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    marccarney
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  3. #3
    Griobhtha NNTP User

    Default Re: OS 11.1 running 3 different power modules


    Well, OpenSuSE may not take ownership or care for this issue.
    KPowerSave is obviously a KDE program, and the help documentation for
    the other modules are KDE as well.

    Nevertheless, the PowerDevil module running by itself seemed to do
    nothing positive except positively use memory. So I stopped and
    disabled the PowerDevil service module.

    KPowerSave only seemed to be intermittently consistent, and I've given
    up (for now) Linux distros' properly implementing suspend to disk and
    RAM, so I saw no need to have it running in memory just to suspend the
    monitor (which I think eats up the most power on my system).

    So I've defaulted to utilizing just the screen power management under
    "Display", and it seems to work perfectly.


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  4. #4
    vjm NNTP User

    Default Re: OS 11.1 running 3 different power modules


    I've wondered about this myself too... As far as I know, PowerDevil is
    the power manager for KDE4 and KPowerSave was for KDE3. In practice,
    however, KPowerSave was used at least by openSUSE in KDE4 while
    PowerDevil was still in development...

    Anyways, this still leaves the display power management in two places
    as you mentioned. I tried with different settings and it seems that the
    timings in the "Display" section are the decisive ones and the timings
    in PowerDevil do nothing. This is using KDE 4.2 RC1 from the build
    service.

    Additionally, one thing I came across with was that if I have
    screensaver starting before the screen is supposed to go into power
    saving, it seems that the screen won't go to power saving state...
    Anyone else seeing this?


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