DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64

pciconf -l (full bus):
hostb0@pci0:0:0:0:  class=0x060000 card=0x11001af4 chip=0x12378086 rev=0x02 hdr=0x00
isab1@pci0:0:1:0:   class=0x060100 card=0x11001af4 chip=0x70008086 rev=0x00 hdr=0x00
atapci0@pci0:0:1:1: class=0x010180 card=0x11001af4 chip=0x70108086 rev=0x00 hdr=0x00   <-- Intel PIIX3 IDE, NOT ATI
none0@pci0:0:1:3:   class=0x068000 card=0x11001af4 chip=0x71138086 rev=0x03 hdr=0x00
vgapci0@pci0:0:2:0: class=0x030000 card=0x11001af4 chip=0x11111234 rev=0x02 hdr=0x00  <-- virtio/QXL-ish, NOT AMD DC
virtio_pci0@pci0:0:3:0: class=0x020000 card=0x00011af4 chip=0x10001af4 rev=0x00 hdr=0x00
virtio_pci1@pci0:0:4:0: class=0x010000 card=0x00021af4 chip=0x10011af4 rev=0x00 hdr=0x00

No PCI device with vendor 0x1002 (ATI) exists on the guest bus.
No ATI IXP/SB SATA/IDE controller ⇒ ata_ati_ident() can never match ⇒
ata_ati_chipinit()/ata_ati_setmode() cannot be instantiated on this guest.

kldstat: kernel, ehci.ko, xhci.ko only (no drm modules).