Comment # 12 on bug 43939 from Ilia Mirkin

Oh, I'm in no way trying to lay the blame away from nouveau :) Just getting the
facts straight. I assume this is just an adapter (i.e. round hole/square peg),
not a converter. In this case, the card would actually drive the port as a DVI
port that just happens to be using a HDMI cable. Which actually makes the
problem more likely to be unrelated to the one in the other bug.

For completeness, could you upload your vbios
(/sys/kernel/debug/dri/0/vbios.rom)?