Comment # 44 on bug 1004453 from Max Staudt

Gaah, I've finally reproduced the problem.
I found a G550 PCIe card, which I put into a Sandy Bridge system.

Leap 42.1 and 42.2 work beautifully, whereas Tumbleweed doesn't.

I tried compiling Tumbleweed's xf86-video-mga on Leap and... it still works.
Dang. I also installed Leap 42.2's KOTD on Tumbleweed - it's still broken on
TW.

Also, it seems that xf86-video-mga is indeed making use of mga.ko. For some
reason, the DDX fails to load it on TW, whereas it auto-loads it on the first X
server start on Leap.

Manually modprobing mga allows X to come up with the mga DDX.

Felix, does 'modprobe mga' and then restarting X help?