[Bug 83677] [HSW] GPU hang on ctx load

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83677

--- Comment #14 from Simon Farnsworth <simon at farnz.org.uk> ---
(In reply to comment #13)
> I've updated the shotgun at #requests. It's been reworked quite a bit since
> then, and I need to double check that it still applies. I think I have a
> germ of a theory as to what is going wrong.

I'm now testing teh requests branch, as of

commit da0c726483f60d4f53de49a4a2753a1d95983bd9
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Sep 18 12:54:55 2014 +0100

    Revert "drm/i915: Enable full PPGTT on gen7"

    This reverts commit 83255c23abe91da047dc71e52be62c42dd4c04a1.

This gets me a new bit of excitement - when I start X for the first time, the
log file says:

[    72.039] (WW) xf86OpenConsole: setpgid failed: Operation not permitted
[    72.039] (WW) xf86OpenConsole: setsid failed: Operation not permitted
[    72.039] (EE) 
Fatal server error:
[    72.039] (EE) xf86OpenConsole: VT_ACTIVATE failed: Input/output error
[    72.039] (EE) 
[    72.039] (EE) 

which it didn't before. Second attempt to start X works fine.

I also get a new message (but not reliably) in dmesg:

[  255.476493] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed...
blitter ring idle

And I've had the machine freeze completely while restarting X11.

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