[systemd-devel] Multi seats setup How-to

[Lennart Poettering]

On Sun, 06.09.15 13:14, arnaud gaboury (arnaud.gaboury at gmail.com) wrote:

> On Sun, Sep 6, 2015 at 1:08 PM, Lennart Poettering
> <lennart at poettering.net> wrote:
> > On Sun, 06.09.15 13:01, arnaud gaboury (arnaud.gaboury at gmail.com) wrote:
> >
> >> On Sun, Sep 6, 2015 at 12:53 PM, Lennart Poettering
> >> <lennart at poettering.net> wrote:
> >> > On Thu, 03.09.15 13:26, arnaud gaboury (arnaud.gaboury at gmail.com) wrote:
> >> >
> >> >> I plan to use the systemd mutli-seat features, but I am not sure at
> >> >> all how I must proceed and in waht order. I understand the main
> >> >> principle for mouse and keyboard: detect the device then
> >> >> $ loginctl attach seatNumber DevicePath
> >> >> As for the graphic card, I am lost.
> >> >>
> >> >> OS: Fedora 22
> >> >> gdm
> >> >> 1 nvidia card
> >> >> 1 USB3 plugable dockin station for the second monitor
> >> >
> >> > I presume this hardware is not marked for "auto seat" yet, using
> >> > udev's ID_AUTO_SEAT property. If you let me know USB product and
> >> > vendor id of this device (as reported by lsusb in hex) I'll add it to
> >> > the default rules files. If that's done then just plugging in the
> >> > device will make it a new seat, without any configuration.
> >>
> >>
> >> Bus 002 Device 005: ID 17e9:4323 DisplayLink
> >
> > The docking station probably is an USB hub with the displaylink device
> > connected to it. the vendor/product ID i am interested in is the id of
> > that hub, i.e. the top-level device in the docking station device.
> 
> If it can help, here is the udev rule and service shipped with the rpm:
> 
> displaylink.service
> -------------------------------
> [Unit]
> Description=DisplayLink Manager Service
> After=display-manager.service
> Conflicts=getty at tty7.service
> 
> [Service]
> ExecStartPre=/sbin/modprobe evdi
> ExecStart=/usr/lib/displaylink/DisplayLinkManager
> Restart=always
> WorkingDirectory=/usr/lib/displaylink
> RestartSec=5
> --------------------------------------------
> 
> /etc/udev/rules.d/99-displaylink.rules
> ACTION=="add", SUBSYSTEM=="usb", ENV{ID_VENDOR}=="DisplayLink",
> MODE="0660", RUN+="/bin/systemctl start displaylink.service"
> ACTION=="remove", SUBSYSTEM=="usb", ENV{ID_VENDOR}=="DisplayLink",
> RUN+="/bin/systemctl stop displaylink.service"

That's awfully generic...

I'd really just be interested in vendor/product ids if the usb hub
that is built into your docking station, where the display link is
connected to.

If in doubt, please run "lsusb" once before you plug in the device,
and once after you plug it in, and let me know the difference: all the
lines that appeared in the output by plugging it in.

Thanks,

Lennart

-- 
Lennart Poettering, Red Hat