[systemd-devel] Two questions about logind and seats

[nerdopolis]

On Wednesday, August 2, 2017 3:17:37 AM EDT Lennart Poettering wrote:
> On Di, 01.08.17 19:32, nerdopolis (bluescreen_avenger at verizon.net) wrote:
> 
> > On Tuesday, August 1, 2017 3:00:25 AM EDT Lennart Poettering wrote:
> > > On Mo, 31.07.17 21:24, nerdopolis (bluescreen_avenger at verizon.net) wrote:
> > > 
> > > > > > First, when I attach a 2nd graphics card to seat1, it seems CanMultisession is
> > > > > > set to 0. Is there a way to change that? or is that only supported on seat0, 
> > > > > > that supports the TTYs?
> > > > > 
> > > > > Yes, this is only supported where VTs are supported, and that is
> > > > > only seat0.
> > > >
> > > > Thanks, It's currently a kernel limitation I assume? I guess I'll worry about 
> > > > multiple sessions on non seat0 seats when it _is_ supported.
> > > 
> > > Yeah the VCs are drawn by the kernel, hence doing multi-session on
> > > other but the first seat would mean either updating the kernel or
> > > doing something purely in userspace with a userspace terminal
> > > renderer. David Hermann was working on something like this, but he
> > > lost interest.
> > > 
> > > Lennart
> > > 
> > > 
> > Out of curiosity, what would the likes of Weston, X, and other Display Servers
> > need on seats outside of seat0? A device to set KD_GRAPHICS on, like a special
> > type of pty or something?
> 
> Nah. Graphical display managers just need a set of DRM and input
> devices to operate on, they require no VTs, ttys, ptys or anything.
> 
> Lennart
> 
> 

Thanks, I was wondering what would be needed from the kernel, and/or user space
to be able to run two Display Servers on seat1/seat-1, and switch between them
though?