[Bug 99979] New: System freezes after resuming with external DP connected monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99979

            Bug ID: 99979
           Summary: System freezes after resuming with external DP
                    connected monitor
           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: stefan at agner.ch
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 129941
  --> https://bugs.freedesktop.org/attachment.cgi?id=129941&action=edit
kernel log recovered via journalctl

I can reproduce this issue with different kernel versions, at least with 4.4,
4.9.11 and currently tested on 4.10.1 (all Arch Linux stock kernels).

My setup involves a Lenovo T440s, ThinkPad Ultra Dock (which has a DP switch
inside) and a Dell U2715H connected via DP to the docking station. The monitor
is DP 1.2 MST/HBR2 capable...

How reproducible:
mostly (it might be timing related as I saw different behavior with different
debug modes)

Steps to Reproduce:
1. Laptop on docking station
2. Boot up laptop, Monitor works fine
3. Put Laptop in sleep mode (suspend to memory)
4. Leave Monitor on and Laptop docked
5. Wake up the Laptop using power button

Actual results:
System seems to freeze. The Laptop screen first flashes up with the desktop
(<1s) but immediately turns black. The external monitor stays off.

Expected results:
Monitor shows desktop as it did before.

Additional info:
Docking/undocking on the same platform works mostly (sometimes (X)Wayland or
some higher level component seems to crash, it might be related as I think it
has to do with the enumeration of the display port (the ports get enumerated
with ever increasing number DP-4, DP-5...)

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