[Bug 106149] New: X fails to start with Raven Ridge APU and 1440p monitor on DVI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106149

            Bug ID: 106149
           Summary: X fails to start with Raven Ridge APU and 1440p
                    monitor on DVI
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: oyvinds at everdot.org
        QA Contact: xorg-team at lists.x.org

Created attachment 138948
  --> https://bugs.freedesktop.org/attachment.cgi?id=138948&action=edit
kernel dmesg with lots of drm / amdgpu error

Xorg will not start, boot log stops at lightdm starting and it does not start
with a 1440p monitor connected via DVI. 

Ryzen 2400G APU:
06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Raven
Ridge [Radeon Vega Series / Radeon Vega Mobile Series] (rev c6)

dmesg shows a red line saying:
[drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 1us * 100 tries -
tgn10_lock line:566
and a ton of other errors, attached.

xorg error log ends with
[   128.160] (EE) modeset(0): failed to set mode: Invalid argument

Kernel is 4.15.17. Mesa version is 17.3.6.

A workaround for this error is to use a HDMI cable. That does work.

I can provide more information on this total scandal bug if someone tells me
what to provide and how.

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