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Thread: System doesn't sleep when plugged into wired LAN

  1. #1
    Join Date
    Oct 2007
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    Ubuntu 12.04 Precise Pangolin

    System doesn't sleep when plugged into wired LAN

    Using Ubuntu 12.04.2 (x86) on my Samsung notebook. When the system is operated with wireless networking, the power-saving features (e.g. sleeping after x minutes) work normally. However, I've noticed that when I have it plugged into wired LAN at home (which I use because the speed is so much better for copying files within my network), the system doesn't ever enter sleep.

    How do I fix this? I suspect the system is receiving traffic over the LAN port that makes it think it should stay "awake."
    Samsung Series 3 15.6" notebook (NP300-V5A-A02US)

  2. #2
    Join Date
    Jun 2007
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    Ubuntu Development Release

    Re: System doesn't sleep when plugged into wired LAN

    Enter your BIOS and disable WOL (Wake on Lan)


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  3. #3
    Join Date
    Oct 2007
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    668
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    Ubuntu 12.04 Precise Pangolin

    Re: System doesn't sleep when plugged into wired LAN

    There isn't any such option.
    Samsung Series 3 15.6" notebook (NP300-V5A-A02US)

  4. #4
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    Jun 2005
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    Toronto, Canada
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    Xubuntu Development Release

    Re: System doesn't sleep when plugged into wired LAN

    Try another sleep/resume while wireless followed by a sleep/resume attempt while wired, then post back the contents of your /var/log/pm-suspend.log file like this:
    Code:
    pastebinit /var/log/pm-suspend.log
    ...and post back the link that is generated.

  5. #5
    Join Date
    Oct 2007
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    668
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    Ubuntu 12.04 Precise Pangolin

    Re: System doesn't sleep when plugged into wired LAN

    Naturally, when I tried to reproduce the problem, it didn't occur.

    I know the machine did stay on all night a couple of nights in a row, so I'm not sure what's really going on.
    Samsung Series 3 15.6" notebook (NP300-V5A-A02US)

  6. #6
    Join Date
    Oct 2007
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    Ubuntu 12.04 Precise Pangolin

    Re: System doesn't sleep when plugged into wired LAN

    I have a clue now. It appears that the problem may have something to do with VLC Media Player. I had it open - although not with a video or audio file being played - last night when I left the machine alone. And it did not suspend, even after hours of sitting there (it should suspend after 10 minutes of inactivity). Could be a bug in VLC Media Player, or in whatever process tells the OS whether it's allowed to suspend.
    Samsung Series 3 15.6" notebook (NP300-V5A-A02US)

  7. #7
    Join Date
    Jun 2005
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    Toronto, Canada
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    Xubuntu Development Release

    Re: System doesn't sleep when plugged into wired LAN

    I don't have vlc installed here, but isn't there an option in the settings to prevent the computer from screen dimming/suspending if its running?

    Also see: http://askubuntu.com/questions/11871...nhibit-suspend.

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