Comment # 170 on bug 60879 from David Verelst

Created attachment 134576 [details]
journalctl -k amdgpu with linux-amd-staging-git

Also no luck with AMDGPU. Here's the kernel output for booting with
linux-amd-staging-git 4.12.0-2a69a4b35621, (on Arch Linux, see also
https://aur.archlinux.org/packages.php?ID=442065).