Initialization  and use of secondary graphics card (Firepro2600) does not work
with new kernels using update drm-next-2018-12-14.

Situation
Amigaone x5000 with Radeon R7 250E in 16x PCIE slot, and Firepro 2260 in 1 x
PCIE slot.

Previously using the following commands would allow the Firepro 2260 to be used
instead of the 250E.

"sudo mv '/usr/lib/xorg/modules/libglamoregl.so'
'/usr/lib/xorg/modules/libglamoregl.so.bak'
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.bak"

Since the incorporation of update drm-next-2018-12-14, initialization of the
Firepro fails and the 250E is used.

If I remove the 250E and place the Firepro 2260 in the 16x PCIE slot it is
initialized and works fine.  The issue is I need to use the 250E for Amiga 4.1
OS.

I have kept various logs but I am not sure this is actually a bug or consistent
with what developers wish to happen.