[Bug 73061] New: Regression: external displayport monitor not detected on GM45 (gen4) intel graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73061

          Priority: medium
            Bug ID: 73061
          Assignee: chris at chris-wilson.co.uk
           Summary: Regression: external displayport monitor not detected
                    on GM45 (gen4) intel graphics
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: sergio.callegari at gmail.com
          Hardware: Other
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/intel
           Product: xorg

Running on a DELL E6500 Laptop.  Using intel graphics stack as distributed with
ubuntu saucy (13.10) 64 bit (in fact kubuntu).

This means

3.11.0 kernel + ubuntu patches
   (but tested also with vanilla 3.12.6 with the same issue)
xorg-server-video-intel 2.99.904
mesa 9.2.1
libdrm 2.4.46

Issue is the following.

1) Laptop on. 
2) Connect an external monitor via displayport
  -> the external monitor is detected.
3) Suspend laptop
4) Detach external monitor
5) Resume laptop after some time and immediately attach external monitor via
display port or attach external monitor via displayport 
  -> the external monitor is NOT DETECTED, xrandr only shows the laptop panel

This is a regression with respect to older ubuntu raring graphics stack, where
the external monitor on displayport was always detected.

Note that after point 5) the system logs report

[drm] HPD interrupt storm detected on connector DP-3: switching from hotplug
detection to polling

which may be relevant.

Also note that after point 5)

6) Wait a couple of minutes
7) Detach external monitor
8) Wait a couple of minutes
9) Attach the external monitor

makes the external monitor detected.

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