FWIW, after upgrading to oneiric, this segfault still occurs. However, if I use xorg packages from debian/testing, the problem disappears. (am using xserver-xorg 1:7.6+9, xserver-xorg-core 2:1.11.1.902-1, xserver-xorg-input-evdev 1:2.6.0-2+b2, which are slightly newer than what oneiric has but more importantly don't have Ubuntu's add-on patches)
FWIW, after upgrading to oneiric, this segfault still occurs. However, if I use xorg packages from debian/testing, the problem disappears. (am using xserver-xorg 1:7.6+9, xserver-xorg-core 2:1.11.1.902-1, xserver- xorg-input- evdev 1:2.6.0-2+b2, which are slightly newer than what oneiric has but more importantly don't have Ubuntu's add-on patches)