Ubuntu
compiz package

  1. Bug #1002641
  2. Comment #4

Comment 4 for bug 1002641

Revision history for this message
Sebastien Bacher (seb128) wrote : Re: after upgrade to 12.04 amd64 Gnome Classic, lightdm will not properly draw second screen

so the issue is not with lightdm (the login screen) but with the session? could you add your .xsession-errors to the bug?