Have you noticed something suspicious by logging with the shell command:
dbus-monitor --system ?
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https://bugs.launchpad.net/bugs/952521
Title:
Screen blanking and dpms can't be turned
TLDR: most likely the issue is fso-deviced
I have a Fujitsu laptop Lifebook and I am using Ubuntu 12.10. Since I
upgraded to this version of Ubuntu I experienced random screen blanking
each few minutes, like a "blank" screensaver. I solved this issue for
myself, but I want to describe it here for