This is a bug in the xserver.
It looks like we are missing this patch in Ubuntu:
http://cgit.freedesktop.org/xorg/xserver/commit/?id=c1d901d723c3bee523736eacc15b44a7dff484fe
With this patch I can't reproduce the problem any more.
** Also affects: xorg-server (Ubuntu)
Importance: Undecided
Status: New
** Changed in: xorg-server (Ubuntu Karmic)
Status: New => In Progress
** Changed in: xorg-server (Ubuntu Karmic)
Assignee: (unassigned) => Alberto Milone (albertomilone)
** Changed in: xorg-server (Ubuntu Karmic)
Importance: Undecided => Medium
** Changed in: gnome-power-manager (Ubuntu Karmic)
Status: Triaged => Invalid
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screen wakes up right after it has been suspended
https://bugs.launchpad.net/bugs/436816
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