Comment 29 for bug 529882

Similar issue after upgrading from karmic to lucid on a Dell Latitude D610 (ati mobility radeon x300)

switch user:
- sometimes works (but not too often)
- sometimes gives a blank screen with live mousepointer, but not able to do anything
- sometimes gives garbled screen
- sometimes I can "escape back" with ctrl-alt-f7
- sometimes ctrl-alt-f7 + ctrl-alt-bkspc (which I have enabled) helps
- sometimes I am not able to get back at all (hard power down required)

similar behavior if trying to do switch user when waking up from sleep.
similar behavior if changing gdm to kdm or gnome to kde