Dear Alex,
I think it would be better to add a quirk flag and only do the extended probe on specific boards where it is required. E.g.,
if (radeon_connector->requires_extended_probe) radeon_ddc_probe_extended(); else radeon_ddc_probe();
Alex
Today, I updated the patch according to your proposal and the proposals of Jean. I'll send it with my next mail.
Best regards
Thomas