I think I'm experiencing the same bug in Ubuntu 8.10, HP 2510p, custom kernel  
2.6.27.7:
sometimes, when recovering from a blank screen because of not using the laptop 
for a few minutes, I see the desktop's Ibex background but all windows, desktop 
icons, and panel have disappeared.
The mouse pointer still moves. No menus can be opened because all events 
(keyboard, mouse click) are unresponsive.
Cannot alt-ctrl-F1.
All I can do is press the power switch and keep it pressed to force a hard 
power off.

This bug seems to happen when I have several windows open, e.g. 2
firefox windows, emacs, terminal, rhythmbox.

-- 
Windows disappear from desktop, but continue to run
https://bugs.launchpad.net/bugs/49740
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