[Bug 111502] Dell XPS15 (HD530 & GeForce 950) external screen via dock/HDMI no text display & gdm freeze

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111502

            Bug ID: 111502
           Summary: Dell XPS15 (HD530 & GeForce 950) external screen via
                    dock/HDMI no text display & gdm freeze
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: not set
         Component: General
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: hajo at hajo.net

Created attachment 145176
  --> https://bugs.freedesktop.org/attachment.cgi?id=145176&action=edit
multiple logs

Fedora 30, Dell XPS15 9550 with Intel HD530, GeForce 950 cards, dual-screen
setup with external display connected through Dell WD15 TB dock and HDMI

Setup worked until kernel 5.0. It broke somewhere around kernel 5.1:

- Booting to runlevel 3, external display remains off
- Booting to gdm, external display remains off during boot, system freezes on
gdm start

Attached lspci, lsmod and dmesg for both (working) kernel 5.0 and (failing)
kernel 5.2. FWIW also attached a failing Xorg.log of kernel 5.2.

Sorry for the tagging, I'm not even sure if this is a i915, nouveau or kernel
issue.

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