This problem also manifested itself coming out of hibernation. GNOME/pm-
utils upstream believes that it was a driver issue that caused the
glitch. Because this happened coming fresh from a clean shutdown, it
seems this problem is due to the radeon driver:

sudo lshw -c display | grep driver
       configuration: driver=radeon latency=0

apt-cache policy xserver-xorg-video-radeon
xserver-xorg-video-radeon:
  Installed: 1:6.13.0-1ubuntu5
  Candidate: 1:6.13.0-1ubuntu5
  Version table:
 *** 1:6.13.0-1ubuntu5 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

apt-cache policy libdrm-radeon1
libdrm-radeon1:
  Installed: 2.4.18-1ubuntu3
  Candidate: 2.4.18-1ubuntu3
  Version table:
 *** 2.4.18-1ubuntu3 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

apt-cache policy radeontool
radeontool:
  Installed: 1.6.1-0ubuntu1
  Candidate: 1.6.1-0ubuntu1
  Version table:
 *** 1.6.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status

-- 
Trash bin distorted after restart in Ubuntu 10.04
https://bugs.launchpad.net/bugs/602475
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