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Date:      Mon, 06 May 2024 19:53:57 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 278212] amdgpu / AMD Radeon XT 6900 - kernel panic (page fault) on FreeBSD 14.0-RELEASE-p6
Message-ID:  <bug-278212-227-93KlItS8HN@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-278212-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-278212-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D278212

--- 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 ma=
nual
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 Acce=
l 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 feat=
ures
lised in man amdgpu.

If anyone knows how to create a fallback configuration based only on SCFB t=
hat
would work with multiple screens and one of them rotated that would be real=
ly
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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