Renoir kernel warnings and crashes with external monitors (DP mst)

[Michel Dänzer]

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On 2020-06-23 2:23 a.m., Qu Wenruo wrote:
> Hi guys,
>
> Firstly thanks for the awesome renoir CPUs.
>
> However it looks like there are still some bugs in the Linux
> support, especially with external monitors.
>
> My setup: - Laptop: Lenovo IdeaPad S540 13ARE (Or, Xiaoxin Pro 13
> in Chinese market) 4800U CPU, with 5.7.4 Arch kernel. (Also tried
> 5.8-rc kernels, even more crashes) The eDP display is 2560x1600
> natively, but to cooperate with external monitors, it's set to
> 1920x1200. And under my daily usage, the lid is closed, thus the
> eDP display shouldn't be involved.
>
> - Two external monitors connected using USB-c dock The dock is HP
> usb-c dock G4, which uses DP alt mode MST for external displays. So
> not DisplayLink garbage, and all monitors are handled by Vega
> internal GPU.
>
> Both external displays are 1080P 60hz, so definitely inside the
> spec for DP 1.2.
>
> - X11 environment xf86-video-amdgpu, along with mesa stack.
>
> With such setup, the kernel boots with warning already related to
> DP MST: https://paste.opensuse.org/54293967

See https://gitlab.freedesktop.org/drm/amd/-/issues/1108 .


- -- 
Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer
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