Hello Balaz, I attach all the commands. You can see the xorg status nvidia driver and the gpuvm "nothing". I see this in my xorg logs: VGA arbiter: cannot open kernel arbiter, no multi-card support.I guess that the problem is that Xorg detects two graphics cards.
I see the line you tell me: Option "UseDisplayDevice" set to "none"; enabling NoScanout. I see the two pci´s in the Xorg logs (I think that this is the problem):
2013-02-19T22:31:51Z Xorg[10108]: unix:0 (--) PCI: (0:1:1:0) 1a03:2000:1a03:2000
2013-02-19T22:31:51Z Xorg[10108]: unix:0 rev 16
2013-02-19T22:31:51Z Xorg[10108]: unix:0
2013-02-19T22:31:51Z Xorg[10108]: unix:0 (--) PCI: (0:2:0:0) 10de:06dd:10de:0780
2013-02-19T22:31:51Z Xorg[10108]: unix:0 rev 163