Similar issue on Ubuntu Lucid 64-bit, upgraded from karmic on a Thinkpad
x200. Switching users typically works a few times, then I get the black
screen. Occasionally there is a mouse pointer, but usually not. I can't
switch to a virtual terminal, and have to ctrl-alt-backspace, which
typically brings up the list of users, with the user I was trying to
switch to no longer logged in.

-- 
black screen when switching between multiple X session
https://bugs.launchpad.net/bugs/529882
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