It apparently is a driver bug, at least for some intel chipsets, see comment #10.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Won't Fix => Confirmed
--
No dri for virtual screen greater than 2048x2048
https://bugs.launchpad.net/bugs/146859
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
