[Bug 278212] amdgpu / AMD Radeon XT 6900 - kernel panic (page fault) on FreeBSD 14.0-RELEASE-p6

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278212

--- Comment #4 from Tomasz "CeDeROM" CEDRO <tomek@cedro.info> ---
I have tried to create a Fallback xorg.conf just to have a usable machine to
work on when amdgpu bugs pops out. I use UEFI boot so SCFB can be used.

Some problems that I have encountered so far looking for a solution with manual
xorg.conf:

1. SCFB does not support multiple display outputs. I have two monitors setup
required for work. Secondary monitor is rotated.

2. Having two monitors active requires kldload amdgpu. Both are cloned by
default. I could use scfb on top of that but also Screen1 is removed as VGA
arbiter does not support multi-card setup.

3. Because I failed at SCFB maybe AMDGPU can be still used with reduced
functionality (i.e. acceleration disabled). But then it turns out when Accel is
off the secondary screen rotation is impossible :D :D So far I have set DRI to
2 and will see what happens. On next crash I will disable/change other features
lised in man amdgpu.

If anyone knows how to create a fallback configuration based only on SCFB that
would work with multiple screens and one of them rotated that would be really
nice so folks can still work on Xorg even no acceleration :-)

By the way I have tried Wayland / Wayfire just to make sure the same problem
occurs. I managed to start Firefox and crash did not happen. But I did not work
a lot on that setup its kinda clunky :-P

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