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

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Date:	Thu, 14 Jun 2012 15:00:46 +0100
From:	Dave Airlie <airlied@...il.com>
To:	"Wouter M. Koolen" <W.M.Koolen-Wijkstra@....nl>
Cc:	intergalactic.anonymous@...il.com, len.brown@...el.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: [3.4 regression] [bisected] DisplayPort fails to come on

On Thu, Jun 14, 2012 at 2:26 PM, Wouter M. Koolen
<W.M.Koolen-Wijkstra@....nl> wrote:
cc'ing Daniel.

> Hi Igor and Len,
>
> When I cold boot 3.4 on my laptop the second monitor attached to the
> displayport stays blank. It works fine with 3.3.8 and earlier.
>
> I get two error messages in dmesg:
>
> kernel: video: probe of LNXVIDEO:00 failed with error -5
>
> kernel: [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
> aborting
>
> When I warm boot 3.4 after running kernel 3.3.8 first, only the first
> message appears and the display works fine.
>
> A bisection based on the occurrence of the first error message resulted in
>
> Author: Igor Murzov <intergalactic.anonymous@...il.com>  2012-03-30 18:32:08
> Committer: Len Brown <len.brown@...el.com>  2012-03-30 20:44:05
> Parent: c16fa4f2ad19908a47c63d8fa436a1178438c7e7 (Linux 3.3)
> Branches: linux-3.4.y, remotes/origin/linux-3.4.y, remotes/origin/master
> Follows: v3.3
> Precedes: v3.4-rc1
>
>    ACPI video: Harden video bus adding.
>
>    It is always better to check return values, so add some new checks and
>    correct existing ones.
>
>    v2: Be consistent and don't mix errors from -E* and AE_* namespaces.
>
>    Signed-off-by: Igor Murzov <e-mail@...e.by>
>    Signed-off-by: Len Brown <len.brown@...el.com>
>
>
> The laptop is a Dell System XPS L702X/0XN71K, BIOS A17 02/22/2012. It has
> two graphics card in Optimus configuration:
> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
> Processor Family Integrated Graphics Controller (rev 09)
> 01:00.0 VGA compatible controller: NVIDIA Corporation Device 124d (rev a1)
>
> I only use the Intel card (which drives the DP port if I am not mistaken)
>
> I hope this is helpful. Please let me know what I can do next to track this
> problem down.
>
> With kind regards,
>
> Wouter Koolen
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