[Bug 276985] crash in LinuxKPI/drm

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276985

--- Comment #59 from Tomasz "CeDeROM" CEDRO <tomek@cedro.info> ---
here goes the report for drm-515-kmod (on 14.1-RELEASE-p4 AMD64 RX580/8GB GPU):
1. cd /usr/ports/graphics/drm-510-kmod; make deinstall.
drm-510-kmod-5.10.163_9.
2. cd /usr/ports/graphics/drn-515-kmod; make install. drm-515-kmod-5.15.160.
3. gpu-firmware-kmod untouched.
4. kldload amdgpu.
5. module loaded correctly, xorg starts, some applications seems to work fine
(blender, freecad, kicad, firefox).
6. then i stared obs and system hung right away. then did power off itself
after some time (kernel panic?).
7. so i rebooted, loaded amdgpu, started xorg and run obs again with no other
applications running, and system hung and powered off itself after some time
(kernel panic?).

looks like drm-515-kmod(-5.15.16) is still unstable and for sure has problems
with hardware acceleration (vaapi?).

just to confirm this problem with 5.15.160, i have double checked again, this
problem does not occur on 5.10.163 nor 6.1.92.

another problem i noticed during this test run is that `kldload amdgpu` breaks
the system for drm 5.15 and 6.1: 
* for 5.10 it leaves computer without screen but responsive there is still a
ping reply, i can work over ssh, i can reboot with ctrl+alt+del.
* for 5.15 and 6.1 there is a kernel panic (not visible on screen as there is
no screen anymore) system powers off after some time.

i may now consider upgrading my main os from 13.3 to 14.1 and simply use 5.10
or 6.1 as alternative for 5.15 :-)

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