You might find this bug report useful:
https://bugs.freedesktop.org/show_bug.cgi?id=12667
I notice that the git changeset which is said to cause the regression
(in that report), adds a check and message "Non-contiguous GTT entries".
Interestingly, the package from Bryce (which fixes the screen but breaks
3d) for me results in this message in my Xorg.0.log. Specifically, I
get an error message:
(EE) intel(0): Non-contiguous GTT entries: (6295552,0x163ffbe000) vs (131072,0x
3f820000)
(WW) intel(0): xf86AllocateGARTMemory: allocation of 1536 pages failed
(Cannot allocate memory)
This doesn't appear in my Xorg.0.log with the stock Gutsy driver.
--
screen artifacts after resume, part row of pixels in error (945GM)
https://bugs.launchpad.net/bugs/91966
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