Intel graphics, GPU Hung

Ben Lavery-Griffiths ben.lavery at
Sat Nov 18 15:03:12 UTC 2017

> On 13 Nov 2017, at 19:03, Pete Wright <pete at> wrote:
> 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
>>> 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:
>> - dmesg.boot
>> - loader.conf
>> - messages
>> - rc.conf
>> - sysctl.conf
>> - Xorg.0.log
>> - Output of `sysctl`
>> I’ve seen a forum post ( 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

Apologies for the slow response, need to check junk mail more regularly…

Many thanks for your reply, I’ve tried this and no luck; however I’ve narrowed my issue down to x11/xdm, which I have enabled in /etc/ttys (as per the handbook <> )
Disabling x11/xdm and starting my desktop (x11-wm/xfce4) manually gives me a GUI without issues.  I’ll raise a bug on x11/xdm.

Many thanks,
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