Comment # 1 on bug 103700 from Hein-Pieter van Braam

I forgot to mention: I run Fedora 27 in userspace with Xorg.

The following package versions may be relevant:

xorg-x11-server-Xorg-1.19.5-1.fc27.x86_64
xorg-x11-drv-amdgpu-1.3.0-3.fc27.x86_64
mesa-dri-drivers-17.2.4-1.fc27.x86_64
libdrm-2.4.85-1.fc27.x86_64