Comment 25 for bug 28925

I have an LCD monitor and TV connected. Disconnecting TV-out and rebooting
doesn't change a thing. However, Option "MonitorLayout" "TMDS,NONE" seems to fix
this problem as pointed out in bug 5623, but of course the detection should
succeed automatically. Now running successfully at 1280x1024.

About the ati-wrapper problem: I can't find a place in code where 5D4F wouldn't
be mentioned where other X800-series cards are, so it might be it's not just a
missing PCI ID. I checked atipciids.h, radeon_chipset.h, radeon_driver.c and
radeon_probe.c. It probably does not matter that this is not really a "X850 Pro"
card but one of these rebranded X800 GTO cards.