https://bugs.freedesktop.org/show_bug.cgi?id=105534
--- Comment #14 from Alex Deucher alexdeucher@gmail.com --- (In reply to philipmorant from comment #13)
No, that's not it either. Apparently it's not going through amdgpu_connector_dvi_mode_valid(). My trace output (using DRM_ERROR()) does not appear in syslog.
That's the legacy pre-DC code.