Re: multiple gdm

[Stephen Adler <adler stephenadler com>]

Thanks guys for the info. Very useful to know these details.
Cheers. Steve.

On Thu, 2015-01-15 at 10:32 -0800, Giovanni Campagna wrote:
> On Thu, Jan 15, 2015 at 10:08 AM, Stephen Adler
> <adler stephenadler com> wrote:
>         Thanks, just to be clear, I don't want one gnome session
>         running on two
>         X servers. I want to run two different instances of gnome,
>         each with its
>         own X server. The idea would be, if all is working, when I
>         boot my
>         system, I'll get two gdm login screens, one for each monitor.
>         I could
>         then have to log in twice, perhaps under different user names.
>         It may
>         sound like a bad hack, but I'm just wondering if somehow I
>         could
>         configure gdm to work of some specified display, like :0.0
>         or :0.1 or
>         something like that.
>
>
> :0.0 and :0.1 refer to different screens (GPUs / root windows) under
> one X server, which is not supported. What I understand you want is :0
> and :1, ie, two completely separate X servers. The easiest way to
> obtain that is to tag the different GPUs and input devices in
> different seats in udev rules - then GDM will automatically start an X
> server on each seat and you'll be able to login.
> Note that you must have two sets of input devices and two separate
> GPUs, because each server will take full control of one.
>
>
> The details for how to configure multiseat are
> at http://www.freedesktop.org/wiki/Software/systemd/multiseat/
>
>
> Giovanni
>  
>         On Thu, 2015-01-15 at 09:45 -0800, Jasper St. Pierre wrote:
>         > GNOME does not support multiple X11 screens. My
>         understanding is that
>         > recent versions of nvidia proprietary added XRandR as a
>         feature, which
>         > is what we require for multi monitor support.
>         >
>         > On Jan 15, 2015 6:31 AM, "Stephen Adler"
>         <adler stephenadler com>
>         > wrote:
>         >         Guys,
>         >
>         >         I'm not sure if this is the right mailing list to
>         ask this
>         >         question so
>         >         forgive if I miss-posted...
>         >
>         >         I have a system with two video cards, quadro K2200
>         and a K620
>         >         and the
>         >         nvidia propriatary driver will not configure a
>         single desktop
>         >         (X server)
>         >         using both cards. It will configure two separate X
>         servers or
>         >         X
>         >         displays, one for each card. So I thought maybe I
>         could run
>         >         two versions
>         >         of gdm, one for each X server or X display (I'm not
>         sure the
>         >         terminology
>         >         here.) :0.0 and :0.1 would be the -display syntax to
>         use. This
>         >         way I
>         >         could have two separate sessions a bit like a KVM
>         switch
>         >         expect I'd have
>         >         two monitors with one keyboard and mouse, and I
>         would move my
>         >         mouse over
>         >         from one monitor to another to switch from one gnome
>         session
>         >         to another.
>         >
>         >         so... how would I configure gdm to run on two X
>         displays or
>         >         servers?
>         >
>         >         Thanks!
>         >
>         >         Steve.
>         >
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