https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #158 from janweber560@gmail.com --- asus strix 390 owner.
gentoo kernel 4.12.3 and amdgpu 1.3.0.
get crash after 10-30seconds dwm.
only think that helps: "echo high > /sys/class/device/drm/card0/power_dpm_force_performance_level" but you have to do this everytime the system start and before launch xserver.
i found this here (at bottom): https://wiki.archlinux.org/index.php/AMDGPU