[Bug 110371] HP Dreamcolor display *Error* No EDID read

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110371

            Bug ID: 110371
           Summary: HP Dreamcolor display *Error* No EDID read
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: Babblebones at gmail.com

My Tonga Firepro W7170M MXM GPU seems to have a bad reaction to kernels higher
than Ubuntu's 4.18 on 18.10.
I just tried a whole bunch of mainlines and Ubuntu 19.04 and nailed it down
that any kernel higher than 4.18 is causing the GPU to no longer be able to get
the EDID of my dreamcolor IPS display.

Not sure how to best go about bisecting this...

It uses a colorboard to convert what I can only assume to be horizontal signal
and vertical signalling information to two separate channels of LVDS from a
single eDP connector coming off the board.

This results in the image shown on screen being completely unreadable with
crazy scan wrapping from the channels getting mixed.

May be related to: https://bugs.freedesktop.org/show_bug.cgi?id=108806

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