(gen3-rendering-limit) Intel Gen3 rendering limits are pitiful
Submitted by Mikhail Gavrilov
Assigned to Xorg Project Team
Moving this from a downstream bug report: https://bugzilla.redhat.com/show_bug.cgi?id=699705
The initial configuration heuristic places monitors horizontally adjacent. That makes total display wider than 2048, which is the maximum size that the 3D engine in the 945 can render to.
This should be fixable, if not fixed, by xserver changes to allow each output to have its own memory allocation instead of sharing a single large one, and modifying the compositor to be aware of this.