Public bug reported:

When starting up Firefox after Thunderbird, or Thunderbird after
Firefox, the system freezes. First the cursor usually freezes and no
input is possible, but the desktop display remains, sometimes for about
ten seconds. Then a pattern of horizontal bars appears on the screen.
The bars are about two or three inches wide and about a quarter inch
high, in various shades of color or black and white.

Pressing Alt+SysRq+1 followed by Alt+SysRq+t does nothing. It is a total
system freeze and requires a cold boot.

Problem began after installing upgrade to Ubuntu 13.04 (raring).

My system is:
   Ubuntu 13.04 (raring)
   Gnome 3.6.3
   Kernel 3.8.0-19 generic
   GCC Version 1.13.3

   CPU Athentic AMD
   Model AMD Athlon 7850 Dual-Core

   Graphics Card: NVIDIA C61 (GeForce 7025 / nForce 630a)

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1176062

Title:
  13.04 (raring) system crash with Firefox or Thunderbird

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