[Bug 227870] i915 video corruption, hangs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227870

            Bug ID: 227870
           Summary: i915 video corruption, hangs
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: mike.d.ft402 at gmail.com

When using 2D and 3D accelerated graphics I get corruption like
missing/blinking characters in fonts, broken transparency and torn rectangles
on screen, black with dark blue dots that sometimes move/blink, which sometimes
also show up in textures.

Every half an hour or so of especially intensive use, such as switching
workspaces a lot or running games/flightgear, I see the screen freeze for a
minute, during which everything non-graphics related keeps going -- then most
of the time it recovers, but if one hang happens more hangs are likely to occur
soon, and sometimes they either start happening without a pause, or perf
degrades so bad I have to kill X or reboot the computer.

During that minute I can not do anything at all:
- switching to console does not work;
- if I suspend to reset the video, the whole machine hangs.

So I either have to reboot it -- or just wait a whole minute.

Might be related to https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194766
but I don't see the same stream of errors, only the "error:
[drm:pid12:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung"
and something else.

Is there a way to at least make this hangcheck run more often, say, every 10
seconds, so I don't have to just sit there?

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