Do you use radeon driver? I found that amdgpu driver could be used to prevent this issue. https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1696231
Do you use radeon driver? I found that amdgpu driver could be used to prevent this issue. https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1696231