[Bug 271814] graphics/gpu-firmware-amd-polaris12: firmware loads but prompt is not available only black screen

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271814

            Bug ID: 271814
           Summary: graphics/gpu-firmware-amd-polaris12: firmware loads
                    but prompt is not available only black screen
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: neimsaci@gmx.com

In both cases: manually loading and through rc.conf result is exactly the same.
Module loads, screen goes black and shortly should return prompt, but remains
black. Keyboard input works fine, reboot, shutdown -r now and CTRL-ALT-DEL
works. Dmesg and kldstat does not showing anything abnormal, last line tells
that drm is initialised on minor 0. Next should be framebuffer but it is not
loaded. Tried with drm-kmod, drm-515-mood and with drm-510-kmod - same result.
I run FreeBSD CURRENT-14.0 main-n263302-4f2cc73f34eb

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