to reinhard: after returning from hibernate or suspend, you can try switch to console (CTRL+ALT+F1) and back to X (CTRL+ALT+F7 or F8), it solved this issue when I had this problem (it has been resolved for me in Intrepid).
to reinhard: after returning from hibernate or suspend, you can try switch to console (CTRL+ALT+F1) and back to X (CTRL+ALT+F7 or F8), it solved this issue when I had this problem (it has been resolved for me in Intrepid).