It seems to have been a problem with the in-kernel part of the driver and KMS,
fixed in the latest kernel update (2.6.31-6):
* I spotted some flicker in usplash and text console as well
* booting without KMS removed it
* it is gone, even with KMS enabled in 2.6.31-6 (and back if booting again on
2.6.31-5, it was not fixed by one of the other updates)
For the record, here is a short answer to your question:
The symptoms are similar to that of bug #399829:
many redraw trigger screen flickering, for exemple moving windows of the gdm
animations, even text scrolling in a terminal
the only difference is that changing the resolution did not work arround it for
me, otherwise, the flickering looked like the one in the video linked in bug
#399829.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete => Fix Released
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screen flickering on dell laptop
https://bugs.launchpad.net/bugs/410305
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