[Bug 271897] graphics/drm-510-kmod: loading amdgpu and i915kms kernel modules simultaneously causes the system to crash

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 13 Jun 2023 05:07:17 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271897

--- Comment #12 from Patrick McMunn <doctorwhoguy@gmail.com> ---
It turns out the black screen with amdgpu was due to the GPU firmware not being
installed. Once the firmware was installed, that issue was resolved. But, for
some reason, I can currently only get SDDM and X to start if neither i915kms
nor amdgpu is loaded (in which case X will use the scfb driver). I'm not sure
what changed. In any case, it's not even clear how relevant that is.

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