I have this problem aswell. Asus P5Q-EM with G45 chipset. VGA output
works fine. With DVI output I can easily reproduce the flickering by
opening 2 terminal windows and do a "find /" in both of them. Lowering
the resolution one step stops the flickering but not a viable
resolution.

I've tested both the distro supplied libdrm2 and intel driver aswell as
the ones supplied here: (drm 2.4.0 and intel 2.5)
http://ppa.launchpad.net/xorg-edgers/ubuntu/pool/main/libd/libdrm/
http://ppa.launchpad.net/thjaeger/ubuntu/pool/main/x/xserver-xorg-video-
intel/

People are referring to worked around this bug by disabling the xrandr
extension, how do I accomplish that?

-- 
[Intrepid] Screen flicker/resync on X4500HD
https://bugs.launchpad.net/bugs/275152
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