(In reply to Benjamin Bellec from comment #65)
> I just bought a Gigabyte "GV-R737WF2OC-2GD" (R7 370).
> Same problem: unable to boot Linux (Fedora 23 GNOME Workstation)
> Same fix: radeon.dpm=0
> 
> It was provided with a VBIOS "015.048.000.061" (F2 release) which I updated
> to "015.048.000.069" (F3 release) without improvement.
> http://www.gigabyte.fr/products/product-page.aspx?pid=5469#bios
> 
> The card works on Windows 10.

You gotta read your VBios and insert values into the kernel source's
drivers/gpu/drm/radeon/si_dpm.c into the quirk list. Google it for how to do
that. Basically, you'll have to get such software (techpowerup provides one, as
far as I remember) and then for your working system, put the needed ones in
thay file and recompile your kernel. Then you may even send a commit :)