maintainer-feedback requested: [Bug 279247] graphics/drm-510-kmod: kernel panic on HP/Compaq nc8430 with Radeon R520 since FBSD 13.3

Bugzilla Automation <[email protected]> has asked freebsd-x11 (Nobody)
<[email protected]> for maintainer-feedback:
Bug 279247: graphics/drm-510-kmod: kernel panic on HP/Compaq nc8430 with Radeon
R520 since FBSD 13.3
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279247



--- Description ---
HP/Compaq nc8430 laptop with ATI Mobility 1600X (R520) GPU was stable in 132
with radeonkms module loaded.
Panics at boot when the module is loaded since upgraded to 13.3-RELEASE

Tried deinstalling/reinstalling drm-510-kmod-5.10.163_9
gpu-firmware-kmod-20240401,1 drm-kmod-20220907_3 to no avail.

Session log using serial console:

FreeBSD/i386 ([edited]) (ttyu0)

login: root
Password:
Last login: Thu May 23 11:32:38 from [edited]
FreeBSD 13.3-RELEASE releng/13.3-n257428-80d2b634ddf0 GENERIC

# kldload radeonkms
<6>[drm] radeon kernel modesetting enabled.
drmn0: <drmn> on vgapci0
vgapci0: child drmn0 requested pci_enable_io
vgapci0: child drmn0 requested pci_enable_io
sysctl_warn_reuse: can't re-use a leaf (hw.dri.debug)!
<6>[drm] initializing kernel modesetting (RV530 0x1002:0x71C5 0x103C:0x30A3
0x00).
[drm ERROR :radeon_atombios_init] Unable to find PCI I/O BAR; using MMIO for
ATOM IIO
<6>[drm] Generation 2 PCI interface, using max accessible memory
drmn0: VRAM: 256M 0x0000000000000000 - 0x000000000FFFFFFF (256M used)
drmn0: GTT: 512M 0x0000000010000000 - 0x000000002FFFFFFF
<6>[drm] Detected VRAM RAM=256M, BAR=256M
<6>[drm] RAM width 128bits DDR
panic: vm_fault_lookup: fault on nofault entry, addr: 0x1000
cpuid = 1
time = 1716457277
KDB: stack backtrace:
#0 0x106fbaf at kdb_backtrace+0x4f
#1 0x1029352 at vpanic+0xf2
#2 0x1029254 at panic+0x14
#3 0x12f3616 at vm_fault+0x1506
#4 0x12f2048 at vm_fault_trap+0x88
#5 0x143d58c at trap_pfault+0x12c
#6 0x143caa2 at trap+0x2a2
#7 0xffc0321f at radeon_bo_move.__warn_on_once+0xdc883777
#8 0x28 at ll+0x7