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

[Qu Wenruo]

On 2020/6/23 下午4:22, Michel Dänzer wrote:
> 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 .
> 
> 
>
OK, that explains the warning.

Although for the crash I still need to setup netconsole to capture the
dying message though.

Thanks,
Qu

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