[Bug 265844] current AMD video card drivers are unreliable

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265844

            Bug ID: 265844
           Summary: current AMD video card drivers are unreliable
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: diyan.pavlov@libero.it

I don't want to write a second bug report about the same motive.

The provided "amdgpu" and "radeon" drivers have a very high chance of freezing 
the system as soon as they are loaded into the Kernel, that can occur
at either loading the modules at boot or after, or at any other time.

info:
Freebsd 13.1 Release AMD64,
Gigabyte Z77MD3H motherboard (AMI bios)
Intel i7-2600; AMD R7 265 "Pitcairn" or HD 7850

Step to reproduce the problem:

1.  XOrg and a graphic environment must be installed.
2.  XOrg is set to use either AMDGPU or RADEON driver.
  as soon as startx is ran, the system freezes

(Alternatively)

Loading kernel modules manually, without necessarily any graphics SW installed.
console: 
1a. #kldload amdgpu 
or 
1b. #kldload radeonkms
     as soon as kldload is ran, the system freezes.

related packages and files:
drm-kmod, radeonkms, pitcairn firmware, amdgpu.

note1: I have used Freebsd with versions of the drivers prior to JAN 2022 and 
I did not experience the following issues.

note2: Sometimes the mentioned drivers will or will not load into kernel, 
at a random success rate and time.

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