I'm also experiencing exactly the same problem on my Lenovo N200 3000; When a second user logs in, then switches ttys (with User Switcher or Ctrl+Alt+Fx, the second user's session crashes (SIGABRT).
$ lspci -vvnn | grep -A1 "VGA " 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller [8086:2a02] (rev 0c) Subsystem: Lenovo Device [17aa:383e]
/var/log/apport.log report: apport (pid 18709) Tue Mar 24 19:58:07 2009: called for pid 18314, signal 6 apport (pid 18709) Tue Mar 24 19:58:07 2009: executable: /usr/bin/Xorg (command line "/usr/X11R6/bin/X :20 -br -audit 0 -auth /var/lib/gdm/:20.Xauth vt9") apport (pid 18709) Tue Mar 24 19:58:07 2009: Ignoring SIGABRT
I'm also experiencing exactly the same problem on my Lenovo N200 3000; When a second user logs in, then switches ttys (with User Switcher or Ctrl+Alt+Fx, the second user's session crashes (SIGABRT).
$ lspci -vvnn | grep -A1 "VGA "
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller [8086:2a02] (rev 0c)
Subsystem: Lenovo Device [17aa:383e]
/var/log/apport.log report: gdm/:20. Xauth vt9")
apport (pid 18709) Tue Mar 24 19:58:07 2009: called for pid 18314, signal 6
apport (pid 18709) Tue Mar 24 19:58:07 2009: executable: /usr/bin/Xorg (command line "/usr/X11R6/bin/X :20 -br -audit 0 -auth /var/lib/
apport (pid 18709) Tue Mar 24 19:58:07 2009: Ignoring SIGABRT