Seeing similar issue here on Intel NUC6i5SYH on Dell U3415Wb monitor on
DP connector. Problem happens when manually switching monitor input from
NUC Ubuntu 17.10 on DP connector to Mac laptop on HDMI connector on same
monitor.
Also cleared my /var/crash folder and submitted two reports using
ubunt
I'm having the same problem.
Using the free radeon driver, applying the rotation restarts X, always
reverting to the no rotation setup.
Using the proprietary fglrx driver, cannot start X having the rotation
setup (actually, it freezes the computer when trying to start X -- no
CTRL+ALT+Fn, no resp
