[Nouveau] [Bug 67628] New: [BISECTED] Monitor on Display port shows distortions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67628

          Priority: medium
            Bug ID: 67628
          Assignee: nouveau at lists.freedesktop.org
           Summary: [BISECTED] Monitor on Display port shows distortions
        QA Contact: xorg-team at lists.x.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: torsten.wagner at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 83446
  --> https://bugs.freedesktop.org/attachment.cgi?id=83446&action=edit
Kernel bisect

Updating to a kernel > 3.8, the monitor connected via display port shows heavy
colour distortions (see attached image). 
I bisect the kernel and it came down to patch 

5cc027f6b1ec651c18a4322ed3e30c6e9cf01e96
(drm/nv50-/disp: move DP link training to core and train from supervisor)

This makes sens, since this patch deals with display port functions. 

The problem appears during boot and hence I guess it is part of the DRM resp.
KMS part.

Attached are dmesg outputs for a working and a non-working kernel.
An image which shows the kind of distortions and the kernel bisect log.

Relevant system infos:

01:00.0 VGA compatible controller: NVIDIA Corporation GF108GL [Quadro 600] (rev
a1)
Display: DELL U2410

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