[Bug 111322] New: Loss of multi-display support when using USB-C Travel Hub after suspend.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111322

            Bug ID: 111322
           Summary: Loss of multi-display support when using USB-C Travel
                    Hub after suspend.
           Product: DRI
           Version: XOrg 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: sellis at redhat.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hardware
 - Lenovo T480s
 - Lenovo USB-C Travel Hub
 - Dell 24" Monitor

OS
 - Fedora 29
 - xorg-x11-drv-intel-2.99.917-42.20180618.fc29.x86_64
 - Kernel 5.1.20-200.fc29.x86_64

I have a HDMI monitor, USB keyboard/mouse and network cable connected to the
Lenovo USB-C travel hub at home.

Sometime when I connect this after the laptop has been suspended I get the
following errors in the system log, and dual monitor support no longer works.

Aug 08 09:56:47 t480s kernel: [drm:intel_dp_start_link_train [i915]] *ERROR*
failed to enable link training
Aug 08 09:56:47 t480s kernel: [drm:intel_mst_pre_enable_dp [i915]] *ERROR*
failed to allocate vcpi
Aug 08 09:56:47 t480s kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe B FIFO underrun
Aug 08 09:56:47 t480s kernel: [drm:intel_mst_pre_enable_dp [i915]] *ERROR*
failed to allocate vcpi

Once I've seen this error I can only run a single display 
 - Joined displays don't work
 - Mirroring doesn't work

I'm still running Xorg due to some other Wayland issues and I can see the
following in my logs when I try and enable my normal joined display

Aug 08 11:24:31 t480s /usr/libexec/gdm-x-session[2657]: (II) modeset(0):
Allocate new frame buffer 3840x1200 stride
Aug 08 11:24:31 t480s /usr/libexec/gdm-x-session[2657]: (EE) modeset(0): failed
to set mode: Invalid argument

Currently my only fix is to reboot the system.

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