Public bug reported:

I've got a Intel GMA 945 graphics card (PCI-ID: 8086:27a6), xserver-
xorg-core (2:1.5.0-1ubuntu1) and xserver-xorg-video-intel
(2:2.4.1-1ubuntu4) on ubuntu intrepid

Since some xorg driver update the screen flickers casually. After some
time working on the machine the screen suddenly got blank an did not
return to normal behavior.

I've attached the log. It show a lot of

(EE) intel(0): underrun on pipe B!

errors.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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Flickering X
https://bugs.launchpad.net/bugs/270116
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