[Bug 250769] Freebsd kernel panic after upgrade to 12.2R when loading amdgpu

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250769

--- Comment #3 from cvelbar at gmail.com ---
Not the original reporter.
My system (Lenovo ThinkCentre desktop) hangs completely when trying to load
amdgpu.
Monitor goes black and system is unresponsive, no ssh and no graceful shutdown
pressing shortly the power button.

I have removed drm-fbsd12.0-kmod and rebuilt it from the updated ports and
making sure to have the sources for 12.2 in /usr/src

Relevant pciconf -lv section

vgapci0 at pci0:10:0:0:    class=0x030000 card=0x314117aa chip=0x15dd1002 rev=0xd3
hdr=0x00
    vendor     = 'Advanced Micro Devices, Inc. [AMD/ATI]'
    device     = 'Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]'
    class      = display
    subclass   = VGA

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