Bug 106149

Summary: X fails to start with Raven Ridge APU and 1440p monitor on DVI
Product: xorg Reporter: Öyvind Saether <oyvinds>
Component: Driver/AMDgpuAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED WONTFIX QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
kernel dmesg with lots of drm / amdgpu error
none
xorg log of xorg failure to start none

Description Öyvind Saether 2018-04-20 14:06:12 UTC
Created attachment 138948 [details]
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.
Comment 1 Öyvind Saether 2018-04-20 14:06:54 UTC
Created attachment 138949 [details]
xorg log of xorg failure to start
Comment 2 Öyvind Saether 2018-04-20 14:54:46 UTC
It appears this is not a bug but a new motherboard with outdated ancient garbage single link DVI made for resolution-lets with 1080p monitors. 

https://www.asus.com/us/Motherboards/TUF-B350M-PLUS-GAMING/specifications/

- Supports HDMI 1.4b with max. resolution 4096 x 2160 @ 24 Hz / 2560 x 1600 @ 60 Hz
- Supports DVI-D with max. resolution 1920 x 1200 @ 60 Hz
- Supports RGB with max. resolution 1920 x 1200 @ 60 Hz
Maximum shared memory of 2048 MB (for iGPU exclusively)

put simply, the HDMI port is the only barely usable port on this motherboard.

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