Comment 4 for bug 363305

Forwarding this bug from a ubuntu reporter:
https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/363305

[Problem]
With UXA enabled, a segfault occurs with this error:
DRM_I915_ENTERVT failed: Unknown error 18446744073709551604

Issue is seen in both 2.6.3 and 2.7.0 (from x-updates).

 distro: Ubuntu
 architecture: x86_64
 kernel: 2.6.28-11-generic
 xserver-xorg: 1:7.4~5ubuntu18
 mesa: 7.4-0ubuntu2
 libdrm: 2.4.5-0ubuntu4
 -intel: 2:2.6.3-0ubuntu9
 -ati: 1:6.12.1-0ubuntu2
 ProcVersion: Linux version 2.6.28-11-generic (buildd@crested) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009

[lspci]
00:00.0 Host bridge [0600]: Intel Corporation 4 Series Chipset DRAM Controller [8086:2e20] (rev 03)
     Subsystem: ASRock Incorporation Device [1849:2e20]
00:02.0 VGA compatible controller [0300]: Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e22] (rev 03)
     Subsystem: ASRock Incorporation Device [1849:2e22]