[Bug 218032] Intel GPU hung during boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218032

            Bug ID: 218032
           Summary: Intel GPU hung during boot
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dmitryluhtionov at gmail.com

Created attachment 181091
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181091&action=edit
sysctl hw.dri.0.info.i915_error_state

During boot process screen freezes on some time, and I see these lines in
dmesg:

Mar 23 11:35:09 m18 kernel: error: [drm:pid12:i915_hangcheck_hung] *ERROR*
Hangcheck timer elapsed... GPU hung
Mar 23 11:35:09 m18 kernel: info: [drm] capturing error event; look for more
information in sysctl hw.dri.0.info.i915_error_state
Mar 23 11:35:09 m18 kernel: error: [drm:pid968:i915_write32] *ERROR* Unknown
unclaimed register before writing to 20a8

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