[Bug 87641] New: Displayport MST Support with Club 3d csv 5300 partly working

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=87641

            Bug ID: 87641
           Summary: Displayport MST Support with Club 3d csv 5300 partly
                    working
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.17.2-031702-generic
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: stephan.schultchen at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

hey,

i have a dell xps 13 ultraboock with an integrated intel graphics adapter, a
Club 3D Displayport Hub + 2 Displays with displayport.

The recent included support for DP MST is only partly working with the  Club 3D
CSV 5300 DP Hub. The two connected displays are only recognised as one display,
and both show the same. They are basically working in clone mode.

But it should be possible to operate the hub in extended mode.

While connecting the adapter to the XPS 13 DP port, these error messages can be
found in dmesg:

[   64.554887] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not
supported
[   64.594831] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not
supported
[   64.634858] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not
supported
[   64.674876] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not
supported
[   64.714898] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not
supported
[   64.754935] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not
supported
[   64.794970] [drm:intel_dp_set_link_train] *ERROR* DP training pattern 3 not
supported
[   64.795191] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting



if further information is needed, please let me know.

sincerly

stephan

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