GNOME lockup

[Kc2LTO - Andrew Ragone]

My machine randomly freezes when im doing work or letting the system idle.
The only way I can recover is to restart. I originally had x86_64 on my
system but installed i386 to see if it still happened...and it does.

My best guess to the problem is something hardware related [i have an old
PCI graphics card]. But I have read that this problem occurs to some other
people and disappears after a few minutes which is not the case on my
system.

-Andrew