If you already tried disabling desktop effects, do you still get problems with your graphics? The i810 error messages in Xorg.0.log are reminiscent of a lot of bug reports and threads across all distros at the time. (It doesn’t take much searching to find them).
I think you have a choice of upgrading Xorg and associated drivers, or installing openSUSE 11.3 (with the improved KMS intel driver).
If you want to try the first approach, you need to add the X11 XOrg repo. This can be done from a console (terminal window). Become root with ‘su -’ command, enter your root password when prompted. Then type
zypper ar http://download.opensuse.org/repositories/X11:/XOrg/openSUSE_11.2/ Xorg
Update with
zypper up
then restart the X-server with CTRL-ALT-Backspace (twice).
See how that goes.