Comment 15 for bug 737891

Ok, well the case of compiz + >4096 width is essentially a dupe of bug 555641 (which is a wishlist X bug - basically X can't do anything about this until Xrandr 1.4, and so config tools will have to check for the invalid configuration).

However, that issue doesn't occur with compiz turned off.

Andres, try connecting a single monitor without the DualHead2Go unit at all in the mix and see if you can reproduce the problem.