IN 12.04 at least, this seems to be tied to Xorg's blanking which by
default happens after 10 minutes/600 seconds. It can be unset via xset
on the commandline, but I finally managed to do this via xorg.conf, like
so:
jani@saegusa:~$ cat /etc/X11/xorg.conf.d/*
Section Extensions
Option
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-power-manager (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/899955
Confirmed on 12.10 Quantal Quetzal. This exact problem began happening
to me after an upgrade from 12.04 to 12.10.
This seems to be a bug with the upgrade process screwing up power
management settings.
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https://bugs.launchpad.net/bugs/899955
Title:
On login ignores setting, turns off screen after idle timeout
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