[Bug 90939] New: [hsw DP-to-VGA] DP hot plug fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90939

            Bug ID: 90939
           Summary: [hsw DP-to-VGA] DP hot plug fails
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: oliver.grafe at ge.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116441
  --> https://bugs.freedesktop.org/attachment.cgi?id=116441&action=edit
dmesg of the failed hot plug attempt with drm.debug=14
i915.disable_power_well=0

==System Environment==
--------------------------

Supermicro X10SAE (C226 Lynxpoint) 
Intel(R) Xeon(R) CPU E3-1268L
Delock 61848 DP->VGA dongle

old hp1530 Monitor attached via active Display-Port->VGA Adapter Cable

Distribution:
SLES11-SP3


==kernel==
--------------------------
4.1-rc4 plus http://patchwork.freedesktop.org/patch/50953/


==Bug detailed description==
Hot-Plugging an active DP->VGA converter the screen does not show an image.

in comparison to #85924 it does not matter if the system is booted with this
adapter plugged in / or if it pulled out and plugged back in with the system
running: Screen does not wake up again.

dmesg with drm.debug=14 i915.disable_power_well=0 attached.
Hotplug event at timecode [  107.158263]

Greetings,
Oliver

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