Could you please try disabling Desktop Effects (Compiz) through
System->Preferences->Appearance->Visual Effects (Tab), reboot, and see
if the problem still exists?
After reproducing the issue, can you switch to a TTY with Ctrl+Alt+F1, login,
and run
cat /var/log/dmesg > dmesg.txt
cat /var/log/Xorg.0.log > Xorg.0.log.txt
Then see if you can switch back to the original session with Ctrl+Alt+F7. What
screen does this give you? (If it's still black, switch back to Ctrl+Alt+F1 and
run "sudo reboot" to reboot".) Then upload the two .txt files you created in
your home directory when you answer the above questions.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Incomplete
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[i945gme] After pressing Switch the user and switch back to the same user, the
screen becomes black
https://bugs.launchpad.net/bugs/585345
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