[Bug 277476] graphics/drm-515-kmod: amdgpu periodic hangs due to phys contig allocations

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277476

--- Comment #3 from Tomasz "CeDeROM" CEDRO <tomek@cedro.info> ---
I also have RX580. After upgrading from 13.2 to 14.0 I got frequent kernel
panics. 

Related reports:
* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276985
* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278212

I noticed that setting manual xorg.conf admgpu DRI=2 make kernel panic less
frequent but instead system got slower and slower until unresponsive, if I
managed to kill xorg in time it could work for a while again until I had to
kill xorg again.

I could not work out fallback with safe non accelerated xorg.conf using scfb
that would allow dual screen setup with one screen rotated. Dual monitor is
only possible with amdgpu loaded. It was also not possible to disable
acceleration in amdgpu and have xrandr (secondary screen rotation).

Rolled back to 13.2. DRM 5.15 / AMDGPU / LinuxKPI makes 14.0 unreliable.

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