linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: don't check inconsistent modeset state when force-restoring

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Date:	Thu, 11 Apr 2013 20:14:10 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	DRI Development <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Airlie <airlied@...il.com>,
	Tomas Melin <tomas.melin@....fi>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	stable <stable@...r.kernel.org>
Subject: Re: [Intel-gfx] [PATCH] drm/i915: don't check inconsistent modeset
 state when force-restoring

On Thu, Apr 11, 2013 at 7:52 PM, Richard Cochran
<richardcochran@...il.com> wrote:
> On Wed, Apr 10, 2013 at 10:03:25PM +0200, Daniel Vetter wrote:
>
>> That patch should crash at all, so this is not expected. Can you pls
>> check whether plain drm-intel-nightly is broken, too?
>
> I did try drm-intel-nightly just now (1dd83e3), and it also freezes
> the machine. I first verified that the power button shutdown is
> working (before starting X). Then, with X running, closing and
> reopening the lid results in a blank screen (no backlight) and a
> seemingly frozen box.

I've just tracked down and fixed an bug which can lead to a hard-hang
in the crtc restore code (which is used both in the lid handler when
opening and on resume). If you could please test this patch (on top of
drm-intel-nightly):

https://patchwork.kernel.org/patch/2428971/

>> I'll quickly port the patch (in it's latest v3 version) to 3.9-rc
>> kernels for you to test.
>
> Okay, I'll try this next.

Thanks, Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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