I think this is fixed already:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/319210
Had the same problem with another SiS driver. The workaround was
disabling "DRIFinishScreenInit" - used only once in the whole code. It
works without the above after this version:
xorg-server (2:1.6.0-0ubuntu1) jaunty; urgency=low
[ Bryce Harrington ]
* New upstream release
- Fixes segfault during X startup for drivers with RANDR < 1.2
(LP: #319210)
- Fixes EDID for monitors that incorrectly report aspect ratio instead
of resolution (LP: #311485)
- Fixes issue where X stops responding to mouse clicks after some time
if using Xinerama. (LP: #296167)
* Add 162_null_crtc_in_rotation.patch: Fixes crash when two displays on
separate cards are attached. X doesn't work with multiple cards yet,
but crashing is not an appropriate way to handle such a situation.
(LP: #139990)
[ Timo Aaltonen ]
* 159_xinerama_focus.patch,
161_force_paired_kbd_device.patch:
- Dropped, applied upstream
-- Bryce Harrington <br...@ubuntu.com> Fri, 06 Mar 2009 14:44:31 -0800
--
Xorg failed to load correct video driver for SIS on-board video card.
https://bugs.launchpad.net/bugs/315324
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