(In reply to Daniel from comment #7) > But I did, in my description: "Since kernel 4.5.0-2 my Xorg.0.log shows that > something is also connected to display port...". > > Up to 4.5.0-1 everything was fine. Oops, sorry, I somehow missed that before. :( I think the most likely culprit is https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ff0bd441bdfbfa09d05fdba9829a0401a46635c1 then, or maybe https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1a738347df2ee4977459a8776fe2c62196bdcb1b Can you try if reverting either of those fixes the problem? Alex, any ideas?