Thanks! I tried several things. Some based off of your answer. Tried installing older kernel and older
xserver-xorg
, but ran into problems installing the actual drivers - there being no
fglrx
package in 16.04 repos. So I tried installing the proprietary drivers manually from AMD homepage - didnt succeed in it. Maybe that was just me. Eventually I solved my problem by installing 14.04 and not updating the kernel (which the Software Updater wants to do all the time, using
apt upgrade
instead). Since this isnt really the answer to the question I asked here, I shouldnt mark it as an answer. —
Carolus 6 mins ago