[Bug 92280] New: Kernel hangs when trying to use DisplayPort 1.2 MST on a Macbook Pro Retina 13' 12,1 with Dell U2414H

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92280

            Bug ID: 92280
           Summary: Kernel hangs when trying to use DisplayPort 1.2 MST on
                    a Macbook Pro Retina 13' 12,1 with Dell U2414H
           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: rsalveti at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118660
  --> https://bugs.freedesktop.org/attachment.cgi?id=118660&action=edit
Syslog with logs from 2 boots, first when I got the hang, and second when it
worked but at 1024x768

When trying to use my Dell U2414H with DisplayPort MST enabled, it either
hangs, or it works partially at 1024x768.

My system:
Architecture: amd64
DistroRelease: Ubuntu 15.10
MachineType: Macbook Pro Retina 13' 12,1
PackageArchitecture: amd64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.3.0-994-generic
root=UUID=18d6ce44-8181-4fa9-b3f8-c5bda84f3d80 ro quiet splash drm.debug=0x06
vt.handoff=7

cod/tip/drm-intel-nightly/2015-10-02
eb69e51ab8c85257b6475053ac86200b423c5b68

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