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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