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@lists.freedesktop.org Reporter: Babblebones@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