I'm having the same issue on a machine with intel GM965 graphics device.
kwin hangs after resuming from suspend-to-ram when compositioning is enabled.
After resuming and entering the password the kde panel is missing and windows
do not respond to mouse and keyboard events.
After killing kwin the kde panel is back there and windows respond again.
Curiously when resuming from suspend with kwin started in a konsole
session, all is working fine so it's difficult to debug the misbehaving
kwin.
** Package changed: ubuntu => kdebase-workspace (Ubuntu)
** Changed in: kdebase-workspace (Ubuntu)
Status: New => Confirmed
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suspend resume fails in kubuntu
https://bugs.launchpad.net/bugs/420924
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