Hi,
it seems that this is a kernel bug, vanilla 2.6.27.3 doesn't show this bug.
So gnome-power-manager (and ubuntu intrepid) is not in cause.
Please close, sorry for the noise.
Jens
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Invalid
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gnome-power-manager blocks in fute
** Attachment added: "backtrace of stuck gnome-power-manager"
http://launchpadlibrarian.net/19507857/gpm-bt.txt
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gnome-power-manager blocks in futex when on battery
https://bugs.launchpad.net/bugs/295906
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