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Date:      Sat, 19 Feb 2022 15:07:03 +0000
From:      bugzilla-noreply@freebsd.org
To:        x11@FreeBSD.org
Subject:   [Bug 262043] update of drm-*kmod breaks AMD GPU support
Message-ID:  <bug-262043-7141-42ElFpscpB@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-262043-7141@https.bugs.freebsd.org/bugzilla/>
References:  <bug-262043-7141@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D262043

--- Comment #2 from Stefan E=C3=9Fer <se@FreeBSD.org> ---
Yes, I know that you suspected the bitbang code and I do agree that this is=
 the
most likely cause.

I do have the hardware and I'm offering my support to get this resolved, be=
fore
the --current version is advanced to the level of the -devel version.

But I have no idea where to start, whether in the kernel, THE LINUXKPI LAYE=
R,
the DRM driver, or the AMDGPU driver.

I'd guess the best approach is to add trace messages or to actually trace
execution (as far as possible for a kernel driver that affect the frame buf=
fer)
in order to identify the exact point of failure.

But as I said, I have no idea where to start ...

--=20
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