[Bug 285271] graphics/drm-kmod (20220907_3) host lockup when radeonkms is part of kld_list

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285271

            Bug ID: 285271
           Summary: graphics/drm-kmod (20220907_3) host lockup when
                    radeonkms is part of kld_list
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: bsdpr@phoe.frmug.org
          Assignee: x11@FreeBSD.org
             Flags: maintainer-feedback?(x11@FreeBSD.org)

On a 13.4-p3 host (BIOS-booted), loading radeonkms via kld_list (in rc.conf)
lead to a black screen and complete host lockup (no ping, no response from the
kayboard), the boot never completes and the machine does not reboot by itself.
When radeonkms is explicitly kldloaded in rc.local or by hand by a logged-in
user, console is set to graphics mode and xorg server is started as expected.

The following packages are installed (latest):
$ pkg info | grep drm 
drm-510-kmod-5.10.163.1304000_11 DRM drivers modules
drm-kmod-20220907_3            Metaport of DRM modules for the linuxkpi-based
KMS components
gpu-firmware-kmod-20241114,1   Firmware modules for the drm-kmod drivers
libdrm-2.4.123,1               Direct Rendering Manager library and headers

The graghics adapter is a "VGA compatible controller: Advanced Micro Devices,
Inc. [AMD/ATI] RV620/M82 [Mobility Radeon HD 3410/3430]".

As a summary: loading the radeonkms later is okay, loading it earlier isn't.

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