[Bug 295512] graphics/drm-66-kmod: sporadic GPU hang with i915kms

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295512

            Bug ID: 295512
           Summary: graphics/drm-66-kmod: sporadic GPU hang with i915kms
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11@FreeBSD.org
          Reporter: jakub_lach@mailplus.pl
             Flags: maintainer-feedback?(x11@FreeBSD.org)
          Assignee: x11@FreeBSD.org

See also: bug #259670

May 22 10:41:24 Thinkpad kernel: drmn0: [drm] Resetting chip for stopped
heartbeat on rcs0
May 22 10:41:24 Thinkpad kernel: drmn0: [drm] *ERROR* failed to set rcs0 head
to zero ctl 00000400 head 1e200b2c tail 00000000 start 00005000
May 22 10:41:24 Thinkpad kernel: drmn0: [drm] MainThread[100744] context reset
due to GPU hang

I confirm that hangs still exist with

FreeBSD 15.1-STABLE #0 stable/15-eb4d18601783

$ pkg info | grep 'drm'                                  
drm-66-kmod-6.6.25.1501500_9   Direct Rendering Manager GPU drivers
libdrm-2.4.133,1               Direct Rendering Manager library and headers

$ pkg info | grep 'mesa' 
mesa-demos-8.5.0               OpenGL demos distributed with Mesa
mesa-dri-24.1.7_11             OpenGL hardware acceleration drivers for DRI2+
mesa-libs-24.1.7_1             OpenGL libraries that support GLX and EGL
clients

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