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[Launchpad Bug Tracker <658705@xxxxxxxxxxxxxxxxxx>]

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The lower part of the screen gets scrambled / distorted sometimes. This
happens very randomly, but not very often. This disruption just
disappears either after a few seconds or always, when the mouse is moved
or any key pressed. Everything is immediately back to normal then. The
last time it occured was today, just a few seconds after login, while
gnome-terminal and firefox open.

This is a Lenovo G550 Laptop. Lucid 10.04 clean installed in April. The
problem occures from that time on until now. I tried newer kernel.org
kernels and the situation does not change. It seems to be a X.org or
Gnome problem.

I was able to take a photo with my phone a while back:
http://web.student.tuwien.ac.at/~e0525417/screen.jpg

part of "lspci":
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 09)

I could not find useful information in /sys/kernel/debug/dri/0/

I have Compiz enabled.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: lucid
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Lower part of the screen gets disrupted occasionally
https://bugs.launchpad.net/bugs/658705
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