https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293351

            Bug ID: 293351
           Summary: radeonkms is not working
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

hello,
I ran into a problem after the next source update and kernel rebuild, loading
radeonkms leads to a dead lock of the system (only the reset helps).  the
buffer is being initialized, its old contents are visible, but the system is
blocked, I tried drm-kmod-6.6, rebuilt the system completely, and then kmod-6.6
the problem remains. Bug 276729 may have a relation.

> uname -aKU
FreeBSD uh1 15.0-STABLE FreeBSD 15.0-STABLE stable/15-93043c650548 MY amd64
1500506 1500506

> pciconf -lv
. . .

vgapci0@pci0:5:0:0:     class=0x030000 rev=0x00 hdr=0x00 vendor=0x1002
device=0x6718 subvendor=0x174b subdevice=0xe182
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Cayman XT [Radeon HD 6970]'
    class      = display
    subclass   = VGA
none2@pci0:5:0:1:       class=0x040300 rev=0x00 hdr=0x00 vendor=0x1002
device=0xaa80 subvendor=0x174b subdevice=0xaa80
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Cayman/Antilles HDMI Audio [Radeon HD 6930/6950/6970/6990]'
    class      = multimedia
    subclass   = HDA
. . .

> pkg info | grep drm
drm-latest-kmod-6.9.1500506_1  DRM drivers modules
drm_info-2.9.0                 Dump info about DRM devices
libdrm-2.4.131,1               Direct Rendering Manager library and headers

> # pkg info | grep firm
gpu-firmware-radeon-kmod-cayman-20220511.1500506 Firmware modules for cayman
Radeon GPUs

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