For me, it happens after a long while. It has not happened lately
though. The only items I found in the messages log from the day I
reported it (and 24 hours prior) are what follows:
Nov 26 07:50:53 scott-laptop rsyslogd: [origin software=rsyslogd
swVersion=4.2.0 x-pid=918
Three years and still going; thanks DracoMoye.
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gnome-screensaver-command --poke no longer inhibits screensaver
https://bugs.launchpad.net/bugs/428884
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Desktop Bugs, which is subscribed to gnome-screensaver in ubuntu.
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I'm getting this too. Changing to another background and back fixes it,
until it happens again.
My PC is 32-bit though.
Also, maybe related, my computer's idle time is no longer reported after
a while, thus my screensaver no longer fires, until I log out and back
in.
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GNOME background being
