Comment 104 for bug 931967

See no sign of screen corruption here in 12.10 with nvidia display adapter (nvidia 8400m
Tested with both nouveau & nvidia drivers on a multi-boot setup.
Additionally tested with grub configured on 12.10, 12.94 & 13.04

What is quite common is a black screen from greeter after initiating the login till the Desktop appears, but that isn't corruption.
So for at least this hardware consider verification done