[Bug 258546] graphics/gpu-firmware-kmod: radeon: ring test failed (scratch(0x15E4)=0xCAFEDEAD)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258546

            Bug ID: 258546
           Summary: graphics/gpu-firmware-kmod: radeon: ring test failed
                    (scratch(0x15E4)=0xCAFEDEAD)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: jmd@freebsd.org
          Reporter: nicholas.h.briggs@gmail.com
          Assignee: jmd@freebsd.org
             Flags: maintainer-feedback?(jmd@freebsd.org)

Created attachment 227951
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=227951&action=edit
Contents of /var/log/messages showing radeon failure on reboot

Since updating to FreeBSD 13.0 RELEASE (currently FreeBSD 13.0-RELEASE-p4) from
FreeBSD 12.2 RELEASE I've been getting failures on boot when loading
boot/modules/radeon_R100_cp_bin.ko (from gpu-firmware-kmod-g20210330)

[drm] Loading R100 Microcode
drmn0: successfully loaded firmware image 'radeon/R100_cp.bin'
[drm] radeon: ring at 0x0000000040001000
[drm ERROR :r100_ring_test] radeon: ring test failed
(scratch(0x15E4)=0xCAFEDEAD)
[drm ERROR :r100_cp_init] radeon: cp isn't working (-22).
drmn0: failed initializing CP (-22).
drmn0: Disabling GPU acceleration
[drm ERROR :r100_cp_fini] Wait for CP idle timeout, shutting down CP.
[drm] radeon: cp finalized

This is an (old) HP/Compaq nc4010 laptop.

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