Right, I just had this problem on latest Feisty. With gnome-power-
manager set to never deactivate the monitor and gnome-screensaver set to
never enable the screensaver, the screen blanked out after 20 minutes.

xset q:
DPMS (Energy Star):
  Standby: 0    Suspend: 0    Off: 0
  DPMS is Enabled
  Monitor is On

Running "xset -dpms" seems to make it work, and xset q now shows:
DPMS (Energy Star):
  Standby: 0    Suspend: 0    Off: 0
  DPMS is Disabled

I suppose a workaround is adding xset -dpms to your startup programs, in
theory. Anyway, an upstream bug in gnome-power-manager linked above
seems to deal with this exactly and even has a new patch as of a couple
weeks ago, so I suppose I'll assign it to gnome-power-manager and set
the upstream watch.

** Bug watch added: GNOME Bug Tracker #347242
   http://bugzilla.gnome.org/show_bug.cgi?id=347242

** Also affects: gnome-power (upstream) via
   http://bugzilla.gnome.org/show_bug.cgi?id=347242
   Importance: Unknown
       Status: Unknown

-- 
Screen blanks when watching movies
https://bugs.launchpad.net/bugs/66257
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