Comment 7 for bug 365994

One ubuntu user has reported a X server freeze with xserver stuck in ioctl() and he installed 2.6.30-rc2 kernel and were able to repro the freeze and capture a full batch buffer dump.

Driver running in: EXA

Exact versions are basically ubuntu jaunty except for the kernel:
intel ddx 2.6.3-0ubuntu9
kernel non-tained 2.6.30rc2
mesa 7.4-0ubuntu3
xserver 1:7.4~5ubuntu18
libdrm 2.4.5-0ubuntu4

Finally his exact chipset is:
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 03)

downstream bug report with all the data you need:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/365994

Direct link to the batch buffer dump:
http://launchpadlibrarian.net/25995147/dri_debug.tgz