[Bug 110139] Driver throws exceptions when external display is connected over HDMI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110139

            Bug ID: 110139
           Summary: Driver throws exceptions when external display is
                    connected over HDMI
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: General
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: bastiborchers at gmx.net

Created attachment 143690
  --> https://bugs.freedesktop.org/attachment.cgi?id=143690&action=edit
The complete output of dmesg

Hello! 
Let me state right now that this is my first bug report and I am a little bit
lost about what criteria I have to fulfill and whether I am reporting for the
correct component.

My system:
I am using Arch Linux with the 5.0.1 Linux kernel.
I have a Thinkpad P1 laptop with an Intel 8750H and an NVidia Quadro P1000.

What happens:
Before I turn on my laptop, I connected my external display via HDMI. Then I
turn on my laptop and reach the bare tty (I am not using any Login Manager).
While the tty is displayed, a lot of kernel messages are printed to the
standard output about nouveau having some problems.
As soon as I try to login (which starts my Window Manager, Sway), the system
freezes and I have to hard reset my Laptop.

Workaround:
When I disconnect the HDMI cable before booting and connect it AFTER I logged
into my system, then my external display works correctly.

I dumped my whole dmesg output into the attached 'system.log' file, and I also
retrieved the VBIOS information for my external display, I think.

Let me know, if I can provide any further information and again, excuse any
noob mistakes.

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