[Bug 100513] New: DisplayPort Audio detected as unplugged with DP 1.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100513

            Bug ID: 100513
           Summary: DisplayPort Audio detected as unplugged with DP 1.2
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dex+fdobugzilla at dragonslave.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130616
  --> https://bugs.freedesktop.org/attachment.cgi?id=130616&action=edit
kernel 4.10.7 drm.debug=14 log

Lenovo Thinkpad T440s connected via DisplayPort to a Dell U3415W will show all
Audio Outputs as unplugged when Monitor is using DP 1.2 mode.

When switching DP 1.2 (and thus MST) off Audio will work.
This monitor is the primary and no secondary MST slave is connected.

The attached log contains a bootup with Monitor attached in DP 1.2 mode, switch
mode, restart X.

Kernel 4.10.7.

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