It may happen because Radeon's BIOS just ignores controller number and
prints modes for the first (zeroth) controller every time. Under qemu
with patched vgabios, driver reads EDID data only from zeroth
controller and report errors for 1 to 7 controllers.
I neither can do anything with broken BIOSes nor drop controller
enumeration, because at least for my T410s with embedded Intel chipset
(I tested it with get-edid utility from read-edid linux package), I
can read EDID for notebook's display only from second controller
(get-edid -m 2).
OK, thanks for the explanation. BIOSes tend to be buggy indeed.
Sometimes it is possible to have some quirks to workaround the bugs,
sometimes the bugs just need to be worked around by the user.
M.D.
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