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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #33 from Simon Farnsworth <simon at farnz.org.uk> ---
(In reply to comment #31)
> (In reply to comment #29)
> > Still scratching my head over that BUG(). I've splattered a few more into
> > #requests, if you could be so kind as to see if that changes the oops.
> > 
> > Meanwhile, current theory is that maybe it is the CS programming around the
> > ctx switch that is the significant change in the shotgun. Still thinking.
> 
> I'm now testing your new #requests branch, as of
> 
> commit cdd8594d0f84e06f99cdd1e5b823b844c4249f6b
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Thu Sep 18 14:27:36 2014 +0100
> 
>     Revert "drm/i915: Enable full PPGTT on gen7"
>     
>     This reverts commit 83255c23abe91da047dc71e52be62c42dd4c04a1.
> 
> I'll let you know the results on Monday.

Without drm.debug=7, this gives me the VT race that ends in X logging:

[    79.069] (++) using VT number 1

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

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