2013 Mac Pro. I am running 5 (!) older Eizo displays via DVI/Thunderbolt adapter. Since upgrading to Big Sur only 4 of them work at a time. Tried every combination, every socket, every sequence. Tried mirroring, changing resolution, restarting. Tried new cables, old cables, adapters with and without power supply. Doesn't work. Only 4 displays run at a time, never all 5. It worked like a charm 6 hours ago before the update.
Waiting for a bug fix.
MACPRO29
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From
München, Deutschland