linux-kernel - Re: [3.4 regression] [bisected] DisplayPort fails to come on

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Message-ID: <4FDA1C03.3020404@cwi.nl>
Date:	Thu, 14 Jun 2012 18:14:43 +0100
From:	"Wouter M. Koolen" <W.M.Koolen-Wijkstra@....nl>
To:	"Wouter M. Koolen" <W.M.Koolen-Wijkstra@....nl>
CC:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...il.com>,
	intergalactic.anonymous@...il.com, len.brown@...el.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	"Barnes, Jesse" <jbarnes@...tuousgeek.org>,
	"Wilson, Chris" <chris.wilson@...el.com>
Subject: Re: [3.4 regression] [bisected] DisplayPort fails to come on

On 06/14/2012 03:48 PM, Wouter M. Koolen wrote:
> In the mean while I will redo the bisect. 
Hi guys,

I did a bisect on the actual problem (and not on the maybe-related 
second error message). It results in 
092945e11c5b84f66dd08f0b87fb729715d377bc:

Author: Adam Jackson <ajax@...hat.com>  2011-07-26 20:39:45
Committer: Daniel Vetter <daniel.vetter@...ll.ch>  2012-01-17 15:46:56
Parent: 6919132e7a307b1f181d7655b3ef64cc7581a5ef (drm/i915/dp: Tweak 
auxch clock divider for PCH)
Branches: linux-3.4.y, remotes/origin/linux-3.4.y, remotes/origin/master
Follows: v3.2-rc6
Precedes: v3.4-rc1

     drm/i915/dp: Use auxch precharge value of 5 everywhere

     The default in the Sandybridge docs is 5, as on Ironlake, and I have no
     reason to believe 3 would work any better.

     Signed-off-by: Adam Jackson <ajax@...hat.com>
     Acked-by: Jesse Barnes <jbarnes@...tuousgeek.org>
     Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>

I guess there is your reason for 3 :)

Any advice on how to proceed would be very helpful.

Cheers,

Wouter
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