[Bug 102479] New: [IGT][SKL] DP hotplug test with Chamelium failing with DP MST hub

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102479

            Bug ID: 102479
           Summary: [IGT][SKL] DP hotplug test with Chamelium failing with
                    DP MST hub
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: paul.kocialkowski at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 133879
  --> https://bugs.freedesktop.org/attachment.cgi?id=133879&action=edit
IGT log

The dp-hpd chamelium subtest fails when executed with a DP MST hub. The test
consists of plugging/unplugging the connector in succession and checking that a
HOTPLUG=1 uevent is received each time. It works fine without a DP MST hub.

The two DP connectors of the Chamelium are connected to a 3-to-1 DP MST hub
that is connected to the DP-2 port of the machine. After pushing the SCAN
button on the hub, the new connectors are enumerated as DP-3 and DP-4. The test
is then executed and it fails to detect the first connector plug, through the
MST hub (see igt log and dmesg attached).

Information about the setup:
* Kernel: drm-tip c52f5322612a688655751c4dd44baa43e39d4dec
* Distro: Arch Linux (NOT using the distro's kernel)
* CPU: i5-6600K

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