Created attachment 721808 [details]
distortions on screen
while 4.4.56-1.g9036908-default worked, vmlinuz-4.4.57-18.3-default did *not*
work. vmlinuz-4.4.57-18.3-vanilla works though. So maybe another patch that
came in after your fixes broke it again?
See screenshot for the error (hard to read, sorry).