I finally came around to testing vanilla 4.15.4, and the problem is in there,
still. Also I'm having trouble translating the patch by Harry to the refactored
code - I guess it should go into display/dc/core/dc_link.c somewhere, but I
don't know where exactly, as there is no update_stream_signal() in there
anymore. The closest place I found is in dc_link_detect(), but I'm uncertain if
I should make the SINGLE or DUAL_LINK decision in there?

Harry, can you look at this or do you need more info from me?

What	Removed	Added
Status	RESOLVED	REOPENED
Resolution	FIXED	---