Re: multiple gdm

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

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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