Public bug reported:

I have a whitebox laptop. Sometimes:

1. When changing from vt7 to vt1{2,3,4} and back to vt7

2. When the screensaver fade-out begins and I move the mouse before it
completes

3. When the screensaver is running and I move the mouse

I get a garbled picture. I can't take a photo of it, but nothing can be
read, I get black where it should be white and distorted fonts.
ctrl+alt+f1 followed by ctrl+alt+f7 fixes it _always_. It doesn't happen
always, just sometimes (I have this laptop for a month now and I can't
figure out if there is a way to reliable reproduce this). It never
happens when the computer boots (i.e. the first gdm login screen is
always ok).

I was hesitant to report this because it's not a showstopper _IF_ you
know how to switch virtual terminals. Otherwise, it renders the machine
completely useless. If you need any information, please let me know.

( I'm really sorry that is an obscure bug )

** Affects: xserver-xorg-driver-nv (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
Garbled screen _sometimes_
https://launchpad.net/bugs/63995

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