This became a problem for me on upgrade to lucid - the machine started
shuttdown when inactive for longer than the inactive period, rather than
suspending.

Looking into the problem, it seems the GConf key “/apps/gnome-power-
manager/actions/sleep_type_battery” is set to hibernate, rather than
suspend (as it previously was). There is no way of setting this
configuration option (or sleep_type_ac) from the GPM preferences in
lucid, leading to confusing behaviour.

It seems that 2.28.1-0ubuntu5 may be responsible for the problem:

> gnome-power-manager (2.28.1-0ubuntu5) lucid; urgency=low
> 
>   * debian/gconf-defaults: remove default preference on
>     /apps/gnome-power-manager/actions/sleep_type_battery (was set to
>     "nothing", however sleep_type_ac is "suspend".). Let's keep upstream
>     default value "hibernate" currently
> 
>  -- Didier Roche <didro...@ubuntu.com>  Fri, 15 Jan 2010 16:43:50 +0100

-- 
Sleep not defined or settable in gnome-power-manager
https://bugs.launchpad.net/bugs/219735
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