Guest (post-reset, clean-source snapshot):
DragonFly dfbsd 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026 root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC x86_64

GPU: virtio VGA only (vgapci0@pci0:0:2:0 chip=0x11111234) -- ZERO AMD/ATI (0x1002) PCI devices
     sysctl hw.drm -> unknown oid (no radeon/drm device attached; radeon KPI not in use)
Guest source /usr/src/sys/dev/drm/radeon/rv770_dpm.c md5 = 044c898d346408165b2f18b045f210c9
Audited tree sys/dev/drm/radeon/rv770_dpm.c     md5 = 044c898d346408165b2f18b045f210c9   (MATCH)

=> rv770_dpm.c DPM paths are hardware-gated on this guest: no RV770-family GPU,
   no VBIOS to craft. Per family convention (DF-3610/3646/3754/3953/3972 and
   DF-3645/3755/3955/3973) the finding is source-certain / runtime-inconclusive.