(In reply to Alex Deucher from comment #9)
> Please try the patch in comment 1.

I've applied the patch and there are no more amdgpu related errors showing up
in dmesg after booting. However, this has not fixed my dual-screen issues; my
HDMI TV displays "no signal" after booting while plugged in my computer, and
when trying to switch display modes using the GNOME control center, my DVI
screen tends to get disabled and display "no signal" too, forcing me to hard
reboot. As far as I can tell, this is the same behavior than before using the
patched kernel. So, my issues may not be related to this bug ticket after all.