Bonjour Youssef,

Sorry, I don't have the answer to your quetion, but I'm interested by
your use case. Did you document your setup somewhere?


On 09/04/2020 13:35, Youssef  GHORBAL wrote:
> Hello,
> 
>       I have a special use case in an HPC environement when we want to run 
> Xorg for 3D acceleration purposes only (basically creating GL contexts)
>       It's what VirtualGL[0] uses to render (server side) GL accelerated apps.
> 
>       When a user is allocated a slot on an HPC compute node with a GPU card, 
> we expect it to be able to run an Xorg (under his identity) bound to the GPU 
> card allocated to him.
>               
>       I think the rootless Xorg topic was alread discussed elsewhere in 
> different distrib channels (Arch, Ubuntu etc) but it was always under the 
> assumtion that we needed a fullly featured Xorg (with displays, input 
> devices, etc) whereas in my use case I just want an Xorg screen for GLX.
> 
>       For now, I can't run Xorg without handing it a tty, so I have to 
> preallocate a tty for a user (and manage the permissions on it) and since 
> Xorg is not able to access input devices I have this message (but Xorg starts 
> neverthelss):
> 
>       xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)
> 
>       My questions would be:
>       - Is there any way/trick to avoid allocating a tty for Xorg (and thus 
> avoid managing tty allocations and permissions)? (maybe this does'nt make 
> sense at all)
>       - Is there any way/trick to avoid Xorg to probe for any input devices 
> at all?
> 
>       Thank you for your help.
> 
> Youssef Ghorbal
> 
> [0] https://virtualgl.org/vgldoc/2_2_1/x11transport.png
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