[Bug 104147] New: SKL Dell docking station second DP not detected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104147

            Bug ID: 104147
           Summary: SKL Dell docking station second DP not detected
           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: rtvernam at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 136013
  --> https://bugs.freedesktop.org/attachment.cgi?id=136013&action=edit
drm-tip kernel config

On a Dell Precision 7510 with a Dell E-Port Plus II docking station, a monitor
on the second display port or dvi plug never shows connected when using the
intel video.
This configuration works just fine on Windows.
The laptop includes an AMD card as well; if I disable the intel video and use
only the AMD video, this configuration also works just fine.
This has never worked as long as I've had this laptop, which dates back to Dec
2015.
I have used many vanilla kernels from probably 4.1 or 4.2 up through current
drm-tip.  The rest of the system is Gentoo.
Kernel command line is: root=/dev/nvme0n1p2 ro init=/usr/lib/systemd/systemd
drm.debug=0xe
I boot the kernel directly from the EFI, I don't use grub or any other
bootloader.

I will have three attachments: kernel-config, dmesg output & xrandr --verbose
output.

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