someone went to the trouble of tracking down some voodoo magic errors
which used not to occur with i810 but now do with the intel driver.
The info in the link is pretty old, and it doesn't provide the info about driver version and hw info.
If the chipset is <965, I suppose this has been fixed (with xf86-video-intel>=2.8 and kernel>=2.6.31).
* Virtual screen size limited to 2048x2048 for pre-965 platforms: bug#21190.
Can you confirm?
And next time when you report intel bugs, please provide more detailed info, referring to http://intellinuxgraphics.org/how_to_report_bug.html. Thanks.
*** This bug has been marked as a duplicate of bug 21190 ***