[LightDM] Multiple sessions on a single seat

[Diego Alvarez]

Hey Robert,

Starting up both sessions at the same time is just a matter of convenience
really and not very important, but it would be nice to be able to configure
other session parameters via dm-tool.
So there isn't really a way to set up what I'd like right now? I'm just
using a boot script to start another session and manually type in the
password and such, but this is kind of inconvenient. It would be nice to
have an option to treat VTs as if they were different seats, so the
configuration I used on previous versions of LightDM would work the same
way as they used to.
I filled a bug report on this some time ago at
https://bugs.launchpad.net/lightdm/+bug/1623358


On Sat, Oct 15, 2016 at 2:03 AM, Robert Ancell <robert.ancell at gmail.com>
wrote:

> Hi Diego,
>
> The only available configuration is the user and the session they use. So
> on startup you could run a boot script that calls dm-tool to start two
> sessions. What you can't do is autologin them both though, so you have to
> have them configured to log in without passwords to have them both start
> instead of just seeing a greeter. If you appropriately configured PAM you
> could get around this, but I suspect it would be a big hack.
>
> Note you can't configure different greeters for the same seat as there's
> only supposed to be one instance of it.
>
> It's not clear to me the advantage of running two sessions on startup
> though - is this just to save time?
>
> --Robert
>
> On Sat, 15 Oct 2016 at 01:16 Diego Alvarez <dpe.alvarez at gmail.com> wrote:
>
> Hey Robert,
>
> Switching sessions on demand could work, but I'd be more convenient to
> have both start on boot. Still, even if I do switch to them on demand I
> cannot configure the new session, it always starts with the same parameters
> as the first one or goes straight to the greeter with some sort of default
> parameters that I cannot configure (depending on the method used to start
> the new session).
> I'd like to be able to for example, run a remote X session on a VT and a
> local one on another, or set up a different DE on each VT.
>
>
> On Wed, Oct 12, 2016 at 11:48 PM, Robert Ancell <robert.ancell at gmail.com>
> wrote:
>
> Hi Diego,
>
> This was never intended to work that way. What is the reason to have
> multiple sessions start automatically instead of just switching to them on
> demand?
>
> --Robert
>
> On Sun, 11 Sep 2016 at 12:56 Diego Alvarez <dpe.alvarez at gmail.com> wrote:
>
> Hello folks,
>
> I'm having some trouble with a LightDM configuration I want to set-up, so
> maybe someone here knows how to do this.
> What I want to do is, when booting, have multiple sessions running at on
> different VTs on a single seat. I mean, only one monitor/keyboard but have
> one user logged in on VT7 and another user on VT8 using another DE and such.
> This was possible on older versions of LightDM, before integrating
> logind's seat detection. I just used the [Seat:x] configuration in
> /etc/lightdm/lightdm.conf and it did exactly what I wanted.
> Problem is that now LightDM uses logind to handle detecting the seats, but
> it seems to ignore the fact one may want to run multiple sessions with one
> seat only. Configuration for the first session works fine, but I can no
> longer tell LightDM to start other X sessions on another VT.
> I can use 'dm-tool' to start another session, but I cannot make it so
> LightDM does that automatically on startup nor configure the new session
> (i.e. autologin, which greeter to use, etc).
> Does anyone know how I can make this set up work?
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>
>
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