Bug#509733:
I can confirm this bug as well on Intel x3100 graphics.
Also, there seems to be some confusion here between xorg and xserver-xorg-core:
The problematic package is xserver-xorg-core.
Lenny: 1.4.2-10
Squeeze: 1.4.2-11
Sid: 1.4.2-11
Experimental: 1.5.99.902-1
xorg is the one with the 7.x versions.
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