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Date:      Sat, 18 Nov 2017 15:02:56 +0000
From:      Ben Lavery-Griffiths <ben.lavery@hashbang0.com>
To:        Pete Wright <pete@nomadlogic.org>, freebsd-x11@freebsd.org
Subject:   Re: Intel graphics, GPU Hung
Message-ID:  <69302C26-1CD8-4F4B-A7A6-A7F709F92F20@hashbang0.com>
In-Reply-To: <2461a3eb-d754-3621-a59d-f77075a0ca0a@nomadlogic.org>
References:  <EB6123C8-3782-42F3-8732-A87D08A5E9D9@hashbang0.com> <2461a3eb-d754-3621-a59d-f77075a0ca0a@nomadlogic.org>

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> On 13 Nov 2017, at 19:03, Pete Wright <pete@nomadlogic.org> wrote:
>=20
>=20
>=20
> On 11/12/17 9:32 AM, Ben Lavery-Griffiths wrote:
>> Hi all,
>>=20
>> Since upgrading to FreeBSD-RELEASE 11.1 I have noticed an =
intermittent issue where XDM isn=E2=80=99t displayed after booting.  A =
mouse pointer usually appears in the middle of the screen and I=E2=80=99m =
able to control it for a short while (less than a minute).  Switching =
back to the console I am greeted with the following message:
>>=20
>>> 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
>>=20
>> - dmesg.boot
>> - loader.conf
>> - messages
>> - rc.conf
>> - sysctl.conf
>> - Xorg.0.log
>> - Output of `sysctl hw.dri.0.info.i915_error_state`
>>=20
>> I=E2=80=99ve seen a forum post =
(https://forums.freebsd.org/threads/62831/) stating that it is an =
=E2=80=98issue=E2=80=99, but haven=E2=80=99t 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?
>=20
> 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:
>=20
> compat.linuxkpi.enable_hangcheck=3D0
>=20
> kinda a shot in the dark, so I'm not too sure.
>=20
> -pete


Apologies for the slow response, need to check junk mail more =
regularly=E2=80=A6

Many thanks for your reply, I=E2=80=99ve tried this and no luck; however =
I=E2=80=99ve narrowed my issue down to x11/xdm, which I have enabled in =
/etc/ttys (as per the handbook =
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x-xdm.html#idp6=
2612968 =
<https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/x-xdm.html#idp=
62612968> )
Disabling x11/xdm and starting my desktop (x11-wm/xfce4) manually gives =
me a GUI without issues.  I=E2=80=99ll raise a bug on x11/xdm.

Many thanks,
Ben

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