Intel graphics, GPU Hung

[Ben Lavery-Griffiths]

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?

Many thanks,
Ben
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