[Bug 241787] graphics/drm causes machine reboot after upgrade from 12.0 to 12.1.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241787

            Bug ID: 241787
           Summary: graphics/drm causes machine reboot after upgrade from
                    12.0 to 12.1.
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: tomek at cedro.info

Hello world :-)

I have just upgraded my machine from 12.0-RELEASE to 12.1-RELEASE with
`freebsd-update upgrade -r 12.1-RELEASE`. Unfortunately the DRM module causes
machine to reboot on load. I had to get into single mode and remove DRM and
i915 modules from rc.conf. I cannot see a DRM for 12.1 yet. Rebuilding module
does not help. I am without DRM right now unable to use external
monitor/projector.

Any hints welcome :-)
Tomek

FreeBSD 0xCFMX4 12.1-RELEASE FreeBSD 12.1-RELEASE r354233 GENERIC  amd64

0xCFMX4% pkg info drm-kmod
drm-kmod-g20190710
Name           : drm-kmod
Version        : g20190710
Installed on   : Thu Nov  7 11:55:49 2019 CET
Origin         : graphics/drm-kmod
Architecture   : FreeBSD:12:*
Prefix         : /usr/local
Categories     : graphics
Licenses       :
Maintainer     : x11 at FreeBSD.org
WWW            : https://github.com/FreeBSDDesktop/kms-drm
Comment        : Metaport of DRM modules for the linuxkpi-based KMS components
Annotations    :
Flat size      : 0.00B
Description    :
amdgpu, i915, and radeon DRM modules for the linuxkpi-based KMS components on
amd64, i915 and radeonkms DRM modules from the former base DRM component on
other architectures.
Metaport for different versions of Linux DRM based on the FreeBSD version
in use. This port encompasses the recommendations of the FreeBSDDesktop team
of DRM versions for FreeBSD versions based on the last update to the LinuxKPI
in that code base. In general, the most recent supported stable DRM for a give
FreeBSD version will be installed. CURRENT receives the most recent development
DRM.
This port does not however hinder the expert user to make other decisions and
continue to install DRM ports directly.

WWW: https://github.com/FreeBSDDesktop/kms-drm

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