[Bug 103631] New: Screen corrupted when using three 4K monitors with USB-C dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103631

            Bug ID: 103631
           Summary: Screen corrupted when using three 4K monitors with
                    USB-C dock
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hawara at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 135329
  --> https://bugs.freedesktop.org/attachment.cgi?id=135329&action=edit
screen corruption example

Hi all.

I've got a Dell XPS 15 9560 running Archlinux with kernel  4.13.11.
I'm using Cinnamon desktop 3.4.6, xorg-server 1.19.5.
The laptop has Nvidia GeForce GTX 1050 (4GB GDDR5); Intel HD Graphics 630.
The intel card is set up with KMS, I don't have xf86-video-intel installed.

I'm trying to use a Dell TB16 dock with two LG 27UD58-B 27" UHD 4K monitors and
a built-in screen. Screens are connected through displayport cables to the TB16
dock.
(Intel(R) Core(TM) i7-7700HQ)

Screens work fine in mirror mode, but as soon as I set the displays to be
horizontally aligned next to eachother, screen corrupts. It works fine if one
of the screens is positioned below the other two.

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