AMDGPU without display output

[Dennis Schridde]

Hello again!

I am trying to use a AMD FirePro S7150X2 with the AMDGPU driver of a Linux 
4.10.9 kernel (CoreOS Container Linux) and linux-firmware 
e39f0e3e6897ad865b3704f61218ae83f98a85da.

Since the card has no display output and I want to run remote applications 
only, I would like to prevent any interference with mode setting and the 
kernel console. Thus I set "nomodeset" on the kernel command line to prevent 
the kernel from trying to initialise anything but the rendering functions of 
the card. However, this leads to following error message:

[drm:init_module [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting.

The result is that the AMDGPU module can not be loaded.

Is this generally the right approach to use this driver for rendering without 
display output, or can I safely leave KMS enabled and it will not interfere 
with my application's X servers and the OpenGL applications running on them?

Assuming I have to disable KMS, how would I get past this error, i.e. to 
initialise the card's rendering functions, but skipping initialisation of the 
output part of the driver?

Generally asking: How do people use this card for GPGPU compute (i.e. 
headless) tasks? Is there some documentation what I need to pay attention to?

Thanks,
Dennis
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