Created attachment 142212 [details]
picture of the corrupted screen

I'm using Ubuntu 18.04.1 and amdgpu 18.40-676022.

After resume to RAM, my screen was corrupted, showing big black horizontal
bands: I attach a picture to show better.

After moving the mouse on the bands, the windows were refreshed and they went
back to normality.

I also attach a bunch of logs as explained here:
https://amdgpu-install.readthedocs.io/en/latest/install-bugrep.html