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

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https://bugs.launchpad.net/bugs/931967

Title:
  Corrupted graphics after the login  until the unity launcher appears

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