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 "DPMS" "Disable"
Option "MIT-SCREEN-SAVER" "Disable"
EndSection
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "DPMS" "Disable"
EndSection
Section "ServerFlags"
Option "NoPM" "true"
EndSection
Section "ServerLayout"
Identifier "X.org Configured"
Option "BlankTime" "0"
Option "StandbyTime" "0"
Option "SuspendTime" "0"
Option "OffTime" "0"
EndSection
It could be that just the ServerLayout section is actually required (and
I'm not sure if other graphics drivers even have a DPMS option of their
own like intel does), as none of the other sections by themselves nor
together prevented the screen from turning off. (The most confusing one
is MIT-SCREEN-SAVER, which I thought was exactly what the xset timeouts
were controlling, but apparently not so, as disabling it does not
prevent the issue either.)
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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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