[Bug 93489] New: [HSW] system hang when connected DP MST monitor is powered on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93489

            Bug ID: 93489
           Summary: [HSW] system hang when connected DP MST monitor is
                    powered on
           Product: DRI
           Version: DRI git
          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: nathan.d.ciobanu at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 120670
  --> https://bugs.freedesktop.org/attachment.cgi?id=120670&action=edit
kernel.log

Using a Dell P2715Q monitor with the DP MST feature turned on as "Primary" and
connected directly to a HSW Lenovo ThinkPad L440 running ArchLinux and
drm-intel-nightly of 12/22/2015 causes the system to hang when the monitor got
turned off and subsequently turned on. Kernel log with the stack dump is
attached. 

Steps to reproduce:
--------------------
- Turn on the MST feature on the Dell P2715Q as 'Primary'
- Connect it to the ThinkPad L440 using a mDP to DP cable (mDP port on the TP
-> DP-in on the monitor)
- ThinkPad is running only ArchLinux without any window server
- Boot the ThinkPad - make sure the Dell monitor displays the ThinkPad UI
- Turn off the Dell monitor by pressing its power button
- After a couple of seconds (time is probably irrelevant) press the ower button
on the monitor to turn it ON
- ThinkPad hangs and needs a PO/PO to recover

System configuration
---------------------
- PC: Lenovo ThinkPad L440
- CPU Architecture: x86_64
- Model name: i5-4300M
- Clock: 2.6GHz
- Memory: 8GB RAM
- Kernel: 4.4.0-rc6-12_22_2015-00913-g7e671e6
- Distro: ArchLinux

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