Comment 3 for bug 357982

I am having this problem (again). I had it fixed some time ago by a combination of packages I do not remember but an official update broke it.

* The screen becomes cropped from the 2048th pixel.
* It is impossible to cross the limit with mouse unless it is crossed first by a window.

Currently compiz does not start with intel driver on gm45 with more than 2048 pixels and this occurs only when expanding to another monitor on the fly. With my fixed combination, this did not occur on fresh start, but this special case has never worked, so be sure to test with it before marking this as fixed.