Intel graphics, GPU Hung

[Pete Wright]

On 11/12/17 9:32 AM, Ben Lavery-Griffiths wrote:
> Hi all,
>
> Since upgrading to FreeBSD-RELEASE 11.1 I have noticed an intermittent issue where XDM isn’t displayed after booting.  A mouse pointer usually appears in the middle of the screen and I’m able to control it for a short while (less than a minute).  Switching back to the console I am greeted with the following message:
>
>> error: [drm:pid12:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
>> info: [drm] capturing error event; look for more information in sysctl hw.dri.0.info.i915_error_state
>> error: [drm:pid0:i915_write64] *ERROR* Unknown unclaimed register before writing to 100000
>> error: [drm:pid908:i915_write32] *ERROR* Unknown unclaimed register before writing to 20a8
>> error: [drm:pid12:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
>> error: [drm:pid0:__gen6_gt_force_wake_mt_get] *ERROR* Timed out waiting for forcewake old ack to clear.
>> error: [drm:pid12:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
>> error: [drm:pid0:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
>> error: [drm:pid0:i915_reset] *ERROR* Failed to reset chip.
> I have uploaded the following files to a gist on Github found here: https://gist.github.com/forquare/2a9e1c3e6a0ec32c3a27a768f1b50371
>
> - dmesg.boot
> - loader.conf
> - messages
> - rc.conf
> - sysctl.conf
> - Xorg.0.log
> - Output of `sysctl hw.dri.0.info.i915_error_state`
>
> I’ve seen a forum post (https://forums.freebsd.org/threads/62831/) stating that it is an ‘issue’, but haven’t managed to find anything else.  Is there some setting which is causing this?  Or a regression that will likely be remain unfixed for a time?

I don't have a 11.1 system handy at the moment, but one think that i
think helped on my current system which ran into a similar issue was to
define this in /boot/loader.conf:

compat.linuxkpi.enable_hangcheck=0

kinda a shot in the dark, so I'm not too sure.

-pete