https://bugs.freedesktop.org/show_bug.cgi?id=107823
--- Comment #24 from Jan Burgmeier jan.burgmeier@unicon-software.com --- I tested with a shorter DP cable but the error still occurs. I don't think it is a cable/hardware problem as the same hardware with kernel parameter dc=0 works just fine.
I tried a Ubuntu 18.04 live stick but it didn't boot. Tomorrow I can try a 18.10 livestick.