I checked this again. It works on nvidia (binary driver) now. Still unable to test it on any ATI-gfx-card, due to lack of hardware.
Regarding the missing unit-test... you could at least add a manual-test derived from your bullet-point list you posted in the comments. Than I'd be ok to give it a +1 when we found someone to test it successfully in a ATI-gfx-card.
I checked this again. It works on nvidia (binary driver) now. Still unable to test it on any ATI-gfx-card, due to lack of hardware.
Regarding the missing unit-test... you could at least add a manual-test derived from your bullet-point list you posted in the comments. Than I'd be ok to give it a +1 when we found someone to test it successfully in a ATI-gfx-card.