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[Jani Uusitalo <jani@xxxxxxxxxxx>]

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.)

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-power-manager in Ubuntu.
https://bugs.launchpad.net/bugs/899955

Title:
  On login ignores setting, turns off screen after idle timeout

Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
  Steps to reproduce:
  1. Disable power saving
  2. (Re-)boot (logoff may suffice, though I've not tested this)
  3. Login and don't touch mouse or keyboard after that
  4. Wait

  What happens:
  Within half an hour (on my system at least) the display signal is turned off (monitor reports "No signal").

  What you expect to happen:
  The screen to stay on as indicated by power saving settings.

  Additional info:
  1. Any keyboard or mouse activity seems to make it obey the setting: after that the screen won't go blank on its own (irregardless of whether or not the bug has manifested itself during the session).
  2. I've disabled screensaver as well, though that probably doesn't concern this bug.
  3. From bug #854624's comments I picked up this settings listing command, in case it helps:

  jani@saegusa:~$ for c in `dconf list /org/gnome/settings-daemon/plugins/power/`; do echo -n "/org/gnome/settings-daemon/plugins/power/${c}="; dconf read /org/gnome/settings-daemon/plugins/power/${c}; done
  /org/gnome/settings-daemon/plugins/power/sleep-display-ac=0
  /org/gnome/settings-daemon/plugins/power/sleep-display-battery=0

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: gnome-power-manager 3.2.1-1
  ProcVersionSignature: Ubuntu 3.2.0-2.6-generic 3.2.0-rc3
  Uname: Linux 3.2.0-2-generic x86_64
  ApportVersion: 1.90-0ubuntu1
  Architecture: amd64
  CheckboxSubmission: 09ae689090491ca53449589269e4bfd8
  CheckboxSystem: edda5d4f616ca792bf437989cb597002
  Date: Sun Dec  4 17:46:51 2011
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  SourcePackage: gnome-power-manager
  UpgradeStatus: Upgraded to precise on 2011-12-01 (2 days ago)

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