[Bug 111507] New: Unable to detect monitor modes connected to a TB16 Dell dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111507

            Bug ID: 111507
           Summary: Unable to detect monitor modes connected to a TB16
                    Dell dock
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: lionel.g.landwerlin at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On drm-tip :

commit 11b7b73ccc160ecf8af7935967c25599e983e21e
Author: Gerd Hoffmann <kraxel at redhat.com>
Date:   Wed Aug 28 11:15:22 2019 +0200

    drm-tip: 2019y-08m-28d-09h-13m-14s UTC integration manifest


I have a monitor connected a Dell TB16 dock (through displayport or hdmi),
itself connected to my laptop through USB Type C.
The monitor appears detected, but no modes are detected :

>From /sys/kernel/debug/dri/0/i915_display_info

Connector info
--------------
connector 86: type eDP-1, status: connected
        physical dimensions: 290x170mm
        subpixel order: Unknown
        CEA rev: 0
        DPCD rev: 12
        audio support: no
        fixed mode:
                "3200x1800": 60 373250 3200 3248 3280 3360 1800 1803 1808 1852
0x48 0xa
        DP branch device present: no
        modes:
                "3200x1800": 60 373250 3200 3248 3280 3360 1800 1803 1808 1852
0x48 0xa
                "3200x1800": 48 298600 3200 3248 3280 3360 1800 1803 1808 1852
0x40 0xa
connector 92: type DP-1, status: disconnected
connector 100: type DP-2, status: disconnected
connector 109: type DP-4, status: disconnected
connector 105: type DP-3, status: disconnected
connector 118: type DP-5, status: connected
        physical dimensions: 600x340mm
        subpixel order: Unknown
        CEA rev: 3
connector 135: type DP-6, status: disconnected
connector 137: type DP-7, status: disconnected
connector 139: type DP-8, status: disconnected

The monitor works fine if I connect it directly to the laptop (through HDMI ->
type-C adaptor).

I tried to bisect things, but it seems somewhat unreliable. It seemed to work
fine on earlier RC of 5.3.0

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