nouveau: w520 dock station: link training failed

[Ilia Mirkin]

On Wed, Jul 16, 2014 at 7:30 AM, Ricardo Ribalda Delgado
<ricardo.ribalda at gmail.com> wrote:
> Hi
>
> I am trying to use a external monitor connected via display port to
> the dock station of a w520. Unfortunately nothing is on the screen and
> dmesg outputs:
>
> [  520.916021] nouveau E[   PDISP][0000:01:00.0] DP:0006:0344: link
> training failed
>
>
> If I connect it to the DP port on the notebook it works as expected
> and the dmesg outputs:
> [  562.099298] nouveau E[     DRM] DDC responded, but no EDID for DP-1
>
> I am using Linux pili 3.14-1-amd64 #1 SMP Debian 3.14.12-1
> (2014-07-11) x86_64 GNU/Linux
>
> The dock station works perfectly with the proprietary driver from nvidia
>
> Is this a known bug? How can I provide a more detailed bug report?

Please give 3.16-rc5 a shot. A considerable amount of rework has gone
into 3.16 for DP support on nouveau. If you're still having issues,
take a look at http://nouveau.freedesktop.org/wiki/Bugs/ for
information on filing bugs.

  -ilia