System doesn't sleep when plugged into wired LAN

**Objekt** · February 28th, 2013

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."

**plucky** · March 1st, 2013

Enter your BIOS and disable WOL (Wake on Lan)

Good Luck

**Objekt** · March 1st, 2013

There isn't any such option.

**Toz** · March 1st, 2013

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.

**Objekt** · March 1st, 2013

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.

**Objekt** · March 2nd, 2013

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.

**Toz** · March 2nd, 2013

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.