Thanks for reporting this bug and any supporting documentation. Since
this bug has enough information provided for a developer to begin work,
I'm going to mark it as confirmed and let them handle it from here.
Thanks for taking the time to make Ubuntu better!

Adding the WorkAround to the Description.

** Changed in: gnome-power
       Status: New => Invalid

** Changed in: gnome-power-manager (Ubuntu)
       Status: Incomplete => Confirmed

** Description changed:

  When my laptop is on mains it sleeps in accordance with gnome-power-
  manager's settings. That is, if I've set it to sleep after 20 minutes of
  inactivity, it does precisely that. However, while on battery power this
  does not happen. The screen is blanked, but the computer never goes into
  suspend. The weird thing is that the screensaver never kicks in (instead
  the screen goes blank whether gpm is running or not), so this might
  actually be a problem with gnome-screensaver. I'm not sure.
  
  For testing purposes I set gnome-screensaver to activate the screensaver
  after 1 minute of inactivity, and gpm to suspend the computer after 2
  minutes of inactivity. I will attach the output of
  
  LC_ALL="en_US.utf8" gnome-power-manager --no-daemon --debug power
  --verbose & sleep 4m && killall gnome-power-manager && gnome-
  screensaver-command -p
  
  Please do tell me if and how I can provide additional information. This
  bug is really annoying as it has resulted in me returning to my laptop
  several times only to find it completely drained on battery.
  
  I'm currently on an up-to-date hardy install.
+ 
+ WORKAROUND: 
+ Looking through gconf, I saw that 
/apps/gnome-power-manager/actions/sleep_type_battery is set to 'nothing' 
instead of 'suspend'. Setting it to suspend caused the computer to sleep after 
2 minutes idle.

-- 
laptop will not sleep after idle time
https://bugs.launchpad.net/bugs/188639
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