4.8.x : [drm:ffffffffa0454792] *ERROR* failed to update link training
From: Toralf FÃrster
Date: Sat Nov 26 2016 - 04:22:32 EST
Whilst 4.7.10 is fine, the current 4.8.10 kernel spews that message in dmesg during boot and later can't be undocked any longer - the vt7 display then will stay black forever.
Switching to another vt works fine FWIW.
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Toralf
PGP: C4EACDDE 0076E94E