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[Bjørn Panyella Pedersen <875504@xxxxxxxxxxxxxxxxxx>]

I found a workaround that works for me. This only works for nvidia-cards.
The problem I appear to have is also discussed here for 10.04: 
http://ubuntuforums.org/showthread.php?t=1476693.

The problem for nvidia in my case is the 'PowerMizer' feature that is
found on laptops using nvidia-drivers. It dynamically underclocks the
GPU when it's not being used much, and this caused the flickering in my
case.

The workaround I have found so far was to follow what was suggested here: 
http://ubuntuforums.org/showthread.php?t=828369&highlight=powermizer

Basically I run this script in the background, forcing my 'Performance
Level' to be fixed at 1.

#!/bin/bash
while true; do
    nice /usr/bin/nvidia-settings -q all &> /dev/null
    sleep 25
done

Ugly, but it works :)

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https://bugs.launchpad.net/bugs/875504

Title:
  terrible screen flicker in 11.10

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