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Date:	Thu, 3 Jan 2013 16:56:34 -0700
From:	Shuah Khan <shuahkhan@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alexey Zaytsev <alexey.zaytsev@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Rodrigo Vivi <rodrigo.vivi@...il.com>,
	Peter Ujfalusi <peter.ujfalusi@...il.com>,
	stable <stable@...r.kernel.org>
Subject: Re: Linux 3.8-rc2

On Thu, Jan 3, 2013 at 3:45 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> On Thu, 3 Jan 2013 13:32:04 -0800, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>> On Thu, Jan 3, 2013 at 1:09 PM, Alexey Zaytsev <alexey.zaytsev@...il.com> wrote:
>> >
>> > i915 got broken on my machine (Lenovo ThinkPad SL500) by this -rc. The screen
>> > goes blank after loading the module. I've bisected the problem to
>> > b0a2658acb5bf9ca86b4aab011b7106de3af0add "drm/i915: don't disable
>> > disconnected outputs".
>>
>> Hmm. Daniel - should I just revert it, or do you have a patch to
>> possibly fix the divide-by-zero error in g4x_compute_wm0() (which may
>> involve not getting that deep in the call chain to begin with or
>> whatever)? Maybe that fixes the blank screen too without a revert..
>
> The issue appears to be a disagreement between intel_crtc->active, an
> attached framebuffer and there not being a valid mode set on the crtc.
>
> It looks like we end up in that situation with further confusion over
> intel_crtc->base.enabled vs intel_crtc->active. I suspect the answer is
> something like:
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index a9fb046..5e4b818 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -7940,10 +7940,8 @@ bool intel_set_mode(struct drm_crtc *crtc,
>                 }
>         }
>
> -       for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc) {
> -               if (intel_crtc->base.enabled)
> -                       dev_priv->display.crtc_disable(&intel_crtc->base);
> -       }
> +       for_each_intel_crtc_masked(dev, prepare_pipes, intel_crtc)
> +               dev_priv->display.crtc_disable(&intel_crtc->base);
>
>         /* crtc->mode is already used by the ->mode_set callbacks, hence we need
>          * to set it here already despite that we pass it down the callchain.
>
> However, until that confusion is unravelled, reverting b0a2658ac, seems
> the most sensible approach.
> -Chris

There is a "radeon 0000:02:00.0: GPU lockup CP stall for more than
10000msec" issue that was in 3.8.-rc1 which is related to drm changes.

Reference:  https://lkml.org/lkml/2013/1/2/289

Good to get that fix into 3.8-rc2.

-- Shuah
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