I have the same bug in Kubuntu 18.04 (I have a AMD GPU).
After read this, with the solution / fixed in post 38: https://bugs.launchpad.net/fedora/+source/xserver-xorg-video-ati/+bug/1841718/comments/38 Thanks at Timo Aaltonen (tjaalton) , I can confirnm that, after install the packages of this ppa, the issue was resolved, its perfect fix for this bug.
Thanks.
I have the same bug in Kubuntu 18.04 (I have a AMD GPU).
After read this, with the solution / fixed in post 38: https:/ /bugs.launchpad .net/fedora/ +source/ xserver- xorg-video- ati/+bug/ 1841718/ comments/ 38
Thanks at Timo Aaltonen (tjaalton) , I can confirnm that, after install the packages of this ppa, the issue was resolved, its perfect fix for this bug.
Thanks.