ubuntu-multiseat team mailing list archive

[Laércio de Sousa <lbsousajr@xxxxxxxxx>]

2014-02-19 3:48 GMT-03:00 Richard Hansen <ubuntu-a7x@xxxxxxxxxxxxxxx>:

> How do you get loginctl to create udev rules for you?
>

Basically:

loginctl list-seats ==> get available seats

loginctl seat-status <seat-id> ==> get list of devices assigned to seat
<seat-id>

loginctl attach <seat-id> /sys/devices/path/to/device ==> assign a device
to seat <seat-id> (attach a master-of-seat device to a non-existent seat to
create it).

 > and MatchSeat key will prevent X server from trying to apply my SM501
> > config to my Intel onboard graphics card.
>
> If I understand the X source code correctly, it shouldn't touch your
> Intel graphics card if your Intel card is associated with a different
> seat (unless you manually specify it in your xorg.conf).
>

In my case, the Intel graphics card doesn't need any further manual setting
in xorg.conf, but the SM501 card does. In principle, I could just write a
custom xorg.conf.sm501 file with the needed settings for my card and pass
it to my non-seat0 X server via "-config" option (e.g.: setting
xserver-config option in lightdm.conf). However, in two scenarios, it's
impossible:

a) when I use GDM as my display manager, since it doesn't allow passing
custom options to X servers.

b) when I use systemd-multi-seat-x wrapper, since it overrides my -config
option with its own one.

To overcome these limitations, I would need to put my SM501 settings in a
.conf file in /etc/X11/xorg.conf.d folder (so that systemd-multi-seat-x
can't override it), but it has a side effect: X server would apply that
file for all seats, potentially misconfiguring my Intel graphics card. To
avoid this conflict, Oleg Samarin has written that MatchSeat patch, so that
a given "Device", "Screen" or "ServerLayout" section in xorg.conf only
applies to the X server with -seat option matching the given MatchSeat
value.

CANTATE DOMINO CANTICUM NOVUM
QUIA MIRABILIA FECIT

Laércio