[Bug 270563] graphics/drm-510-kmod: hangs on HP/Compaq nc8430 with Radeon R520 since FBSD 13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270563

            Bug ID: 270563
           Summary: graphics/drm-510-kmod: hangs on HP/Compaq nc8430 with
                    Radeon R520 since FBSD 13
           Product: Ports & Packages
           Version: Latest
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: alainthailande@yahoo.com
          Assignee: x11@FreeBSD.org
             Flags: maintainer-feedback?(x11@FreeBSD.org)

Fresh install of FreeBSD 13.1 386 on a HP/Compaq nc8430 laptop that has an ATI
Mobility 1600X (R520) GPU.

Xorg hangs solid at startup, can't even kill -15 or -9 it. Have to reboot.
Sometimes black empty screen, sometimes with a dead mouse cursor in the middle
and a white rectangle (text cursor?) in the upper left corner.

==> Same setup works perfectly in FreeBBSD 12.4

No error in Xorg.0.log, drm and radeonkms modules load OK at boot.
No error in dmesg either.

Tried with both radeon and modesetting Xorg drivers, with more or less the same
outcome.

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