On Wed, 2 Aug 2017, Adam Ciarci?ski wrote:
vga0 at pci1 dev 0 function 0: vendor 1002 product 4c66 (rev. 0x02) drm at vga0 not configured
Did you take a look at the pcidevs file in the kernel to see if vendor 1002 product 4c66 was supported? If not, that'd be the first problem and the fix (if indeed it's simply just a Radeon 9000) is to edit the file and add the IDs to the appropriate driver section.
However, I suspect it's a conflict with the various DRM subsystems that are out there.
-Swift