[Bug 262982] FreeBSD 13.1-RC1 Graphics Not Working

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262982

--- Comment #12 from Bjoern A. Zeeb <bz@FreeBSD.org> ---
(In reply to Warner Losh from comment #11)

Given people say it happened between BTEA3 and RC1 there are very few commits.
I installed an RC1 and pkg installed drm-fbsd13-kmod and the module i915kms.ko
loads.

My current guess is that D33915 MFCed with the new struct field at the end (
https://cgit.freebsd.org/src/commit/?h=releng/13.1&id=c325d9edeff568d3d38891b2916bd5bd0e9bf8e3
) is causing trouble and adjusting the check to be >= 0 for BUS_PROBE_DEFAULT
will do the trick ... and it does seem to as now I get drmn0: fb0: i915drmfb
frame buffer device ...

I'll deal with this before RC2;  the binary packages are still fine;  the MFC
rules and requested solution to the problem in D33915 are not.  Let's take that
there.

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