LightDM - Sep 2014 - [systemd-devel] loginctl - multi-seats

...
> /etc/lightdm/lightdm.conf
> [LightDM]
> minimum-display-number=0
> minimum-vt=1
> user-authority-in-system-dir=true
> 
> [SeatDefaults]
> greeter-session=lightdm-greeter
> session-wrapper=/etc/X11/xinit/Xsession
> 
> [Seat:0]
> xserver-command=/usr/bin/Xorg
> xserver-config=/etc/X11/xorg.conf.nouveau
> 
> [Seat:1]
> xdg-seat=seat-fu
> xserver-command=/usr/bin/Xorg -sharevts -novtswitch
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> /etc/X11/xorg.conf.nouveau
> Section "Device"
>     Identifier  "nvidia0"
>     Driver      "nouveau"
> EndSection
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> $ loginctl seat-status seat0
> seat0
> 	Sessions: *1086 c15
> 	 Devices:
> 		  ...
> 		  ??/sys/devices/pci0000:00/0000:00:10.0/0000:01:00.0/drm/card1
> 		  ? drm:card1
> 		  ??/sys/devices/pci0000:00/0000:00:10.0/0000:01:00.0/graphics/fb0
> 		  ? [MASTER] graphics:fb0 "nouveaufb"
> 		  ...
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> $ udevadm info -q env -p /sys/class/drm/card1
> DEVNAME=/dev/dri/card1
> DEVPATH=/devices/pci0000:00/0000:00:10.0/0000:01:00.0/drm/card1
> DEVTYPE=drm_minor
> ID_FOR_SEAT=drm-pci-0000_01_00_0
> ID_PATH=pci-0000:01:00.0
> ID_PATH_TAG=pci-0000_01_00_0
> MAJOR=226
> MINOR=1
> SUBSYSTEM=drm
> TAGS=:seat:uaccess:
> USEC_INITIALIZED=67185
> 
> ~~~~~~~~~~~~~~~~~~~~~~
> 
> $ man 1 loginctl
>        attach [NAME] [DEVICE...]
>        ...
>        flush-devices
> 
> ~~~~~~~~~~~~~~~~~~~~~~
> 
> /etc/udev/rules.d/72-seat-drm-pci-0000_00_04_1-usb-0_6_1_0.rules 
> TAG=="seat",
ENV{ID_FOR_SEAT}=="drm-pci-0000_00_04_1-usb-0_6_1_0",
ENV{ID_SEAT}="seat-fu"
> 
> /etc/udev/rules.d/72-seat-graphics-pci-0000_00_04_1-usb-0_6_1_0.rules 
> TAG=="seat",
ENV{ID_FOR_SEAT}=="graphics-pci-0000_00_04_1-usb-0_6_1_0",
ENV{ID_SEAT}="seat-fu"
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> $ loginctl seat-status seat-fu
> seat-fu
>         Sessions: *1 c1
>          Devices:
>                  
??/sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/drm/card0
>                   ? drm:card0
>                  
??/sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/graphics/fb1
>                     [MASTER] graphics:fb1 "udldrmfb"
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> $ udevadm info -q env -p /sys/class/drm/card0
> DEVNAME=/dev/dri/card0
> DEVPATH=/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/drm/card0
> DEVTYPE=drm_minor
> ID_FOR_SEAT=drm-pci-0000_00_04_1-usb-0_6_1_0
> ID_PATH=pci-0000:00:04.1-usb-0:6:1.0
> ID_PATH_TAG=pci-0000_00_04_1-usb-0_6_1_0
> ID_SEAT=seat-fu
> MAJOR=226
> MINOR=0
> SUBSYSTEM=drm
> TAGS=:seat:seat-fu:uaccess:
> USEC_INITIALIZED=465981
> 
> ~~~~~~~~~~~~~~~~~~~~~~~
> 
> $ modinfo -n nouveau
>
/lib/modules/3.15.10-200.fc20.x86_64/kernel/drivers/gpu/drm/nouveau/nouveau.ko
> 
> $ rpm -qf /usr/lib64/xorg/modules/drivers/nouveau_drv.so
> xorg-x11-drv-nouveau-1.0.10-1.fc20.x86_64
> 
> $ modinfo -n udl
> /lib/modules/3.15.10-200.fc20.x86_64/kernel/drivers/gpu/drm/udl/udl.ko
> 
> $ rpm -qf /usr/lib64/xorg/modules/drivers/modesetting_drv.so
> xorg-x11-drv-modesetting-0.8.0-2.fc20.x86_64
> 
> $ rpm -q systemd
> systemd-208-21.fc20.x86_64
> 
> $ rpm -qf /usr/bin/Xorg
> xorg-x11-server-Xorg-1.14.4-11.fc20.x86_64
> 
> $ rpm -qf /etc/lightdm/lightdm.conf
> lightdm-1.11.4-1.fc20.x86_64
> 
> 
> Xorg without root
> https://lists.fedoraproject.org/pipermail/test/2014-July/122190.html
> 

This is a bare minimum config achieved for a multi(dual)seat setup via
lightdm-1.11.7

~~~~~~~~~~~~~~~~~~~~~~~~~
/etc/lightdm/lightdm.conf
[LightDM]
minimum-vt=1
[SeatDefaults]
session-wrapper=/etc/X11/xinit/Xsession
[Seat:seat0]
xserver-config=/etc/X11/xorg.conf.nouveau

                          ~~~~~~~~~~~~~~~

/etc/X11/xorg.conf.nouveau
Section "Device"
    Identifier       "nvidia0"
    Driver           "nouveau"
EndSection
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ loginctl 
   SESSION        UID USER             SEAT            
        c1        105 lightdm          seat-fu         
        c2        105 lightdm          seat0           
         1        501 poma             seat0           
         2        502 pia              seat-fu         


root tty1 /usr/bin/X :0 -seat seat0 -novtswitch -auth /var/run/lightdm/root/:0
-nolisten tcp vt1 -config /etc/X11/xorg.conf.nouveau
root ?    /usr/bin/X :1 -seat seat-fu -sharevts -auth /var/run/lightdm/root/:1
-nolisten tcp


kernel-3.15.10-201.fc20.x86_64
systemd-208-21.fc20.x86_64
xorg-x11-server-Xorg-1.14.4-11.fc20.x86_64
lightdm-1.11.7-1.fc20.x86_64
lightdm-gtk-1.8.6-1.fc20.x86_64


poma

$ systemctl get-default 
graphical.target

~~~~~~~~~~~~~~~~

$ systemctl show display-manager -p Id
Id=lightdm.service

~~~~~~~~~~~~~~~~~~

$ systemctl is-enabled display-manager
enabled

~~~~~~~

$ systemctl is-active display-manager
active

~~~~~~~~~~~~~~~~~~~~~~~

$ lightdm --show-config
   [LightDM]
A  minimum-vt=1

   [SeatDefaults]
A  session-wrapper=/etc/X11/xinit/Xsession

   [Seat:seat0]
A  xserver-config=/etc/X11/xorg.conf.nouveau

Sources:
A  /etc/lightdm/lightdm.conf

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ grep -v ^# /etc/lightdm/lightdm.conf
[LightDM]
minimum-vt=1

[SeatDefaults]
session-wrapper=/etc/X11/xinit/Xsession

[Seat:seat0]
xserver-config=/etc/X11/xorg.conf.nouveau

               ~~~~~~~~~~~~~~~~~~~~~~~~~~

$ cat /etc/X11/xorg.conf.nouveau
Section "Device"
    Identifier       "nvidia0"
    Driver           "nouveau"
EndSection

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ alternatives --display lightdm-greeter
lightdm-greeter - status is manual.
 link currently points to /usr/share/xgreeters/lightdm-gtk-greeter.desktop
/usr/share/xgreeters/lightdm-gtk-greeter.desktop - priority 20
Current `best' version is /usr/share/xgreeters/lightdm-gtk-greeter.desktop.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ grep -v ^# /etc/lightdm/lightdm-gtk-greeter.conf 
[greeter]
font-name=Sans 20
xft-antialias=true
xft-dpi=96
xft-hintstyle=hintfull
xft-rgba=rgb
show-indicators=~host;~spacer;~clock;~spacer;~session;~power

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ grep -i drivers /var/log/Xorg.0.log
[    30.397] (II) Loading /usr/lib64/xorg/modules/drivers/nouveau_drv.so

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ ps axu | grep [X]org
root       584  0.3  1.2 219960 42272 tty1     Ss+  04:26   0:02
/usr/libexec/Xorg.bin :0 -config /etc/X11/xorg.conf.nouveau -seat seat0 -auth
/var/run/lightdm/root/:0 -nolisten tcp vt1 -novtswitch

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ loginctl list-sessions 
   SESSION        UID USER             SEAT            
        c1        989 lightdm          seat0           
         1       1001 poma             seat0           

2 sessions listed.

~~~~~~~~~~~~~~~~~~~~~~~~

$ ls /etc/udev/rules.d/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ loginctl seat-status seat0
seat0
        Sessions: *1 c1
         Devices:
                  ...
                  ?
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-5/2-5:1.0/sound/card0
                  ? ? sound:card0 "Set"
                  ?
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-5/2-5:1.3/0003:0D8C:000C.0003/input/input6
                  ? ? input:input6 "C-Media USB Headphone Set  "
                  ?
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-9/2-9:1.0/0003:1997:2433.0004/input/input7
                  ? ? input:input7 "  Mini Keyboard"
                  ?
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-9/2-9:1.1/0003:1997:2433.0005/input/input8
                  ?   input:input8 "  Mini Keyboard"
                  ...
                  ?
??/sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/drm/card1
                  ? ? drm:card1
                  ?
??/sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/graphics/fb1
                  ?   [MASTER] graphics:fb1 "udldrmfb"
                  ...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ loginctl attach seat1 \
> /sys/devices/pci0000:00/0000:00:04.0/usb2/2-5/2-5:1.0/sound/card0 \
>
/sys/devices/pci0000:00/0000:00:04.0/usb2/2-5/2-5:1.3/0003:0D8C:000C.0003/input/input6
\
>
/sys/devices/pci0000:00/0000:00:04.0/usb2/2-9/2-9:1.0/0003:1997:2433.0004/input/input7
\
>
/sys/devices/pci0000:00/0000:00:04.0/usb2/2-9/2-9:1.1/0003:1997:2433.0005/input/input8
\
> /sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/drm/card1 \
> /sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/graphics/fb1
==== AUTHENTICATING FOR org.freedesktop.login1.attach-device ==Authentication is
required for attaching a device to a seat.
Authenticating as: root
Password: 
==== AUTHENTICATION COMPLETE ==
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ ls -1 /etc/udev/rules.d/
72-seat-drm-pci-0000_00_04_1-usb-0_6_1_0.rules
72-seat-graphics-pci-0000_00_04_1-usb-0_6_1_0.rules
72-seat-input-pci-0000_00_04_0-usb-0_5_1_3.rules
72-seat-input-pci-0000_00_04_0-usb-0_9_1_0.rules
72-seat-input-pci-0000_00_04_0-usb-0_9_1_1.rules
72-seat-sound-pci-0000_00_04_0-usb-0_5_1_0.rules

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ cat /etc/udev/rules.d/72-seat-*
TAG=="seat",
ENV{ID_FOR_SEAT}=="drm-pci-0000_00_04_1-usb-0_6_1_0",
ENV{ID_SEAT}="seat1"
TAG=="seat",
ENV{ID_FOR_SEAT}=="graphics-pci-0000_00_04_1-usb-0_6_1_0",
ENV{ID_SEAT}="seat1"
TAG=="seat",
ENV{ID_FOR_SEAT}=="input-pci-0000_00_04_0-usb-0_5_1_3",
ENV{ID_SEAT}="seat1"
TAG=="seat",
ENV{ID_FOR_SEAT}=="input-pci-0000_00_04_0-usb-0_9_1_0",
ENV{ID_SEAT}="seat1"
TAG=="seat",
ENV{ID_FOR_SEAT}=="input-pci-0000_00_04_0-usb-0_9_1_1",
ENV{ID_SEAT}="seat1"
TAG=="seat",
ENV{ID_FOR_SEAT}=="sound-pci-0000_00_04_0-usb-0_5_1_0",
ENV{ID_SEAT}="seat1"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ su -c 'systemctl restart systemd-udev-trigger.service'
Password: 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ grep -i drivers /var/log/Xorg.1.log
[  1438.393] (II) Loading /usr/lib64/xorg/modules/drivers/modesetting_drv.so
[  1438.397] (II) modesetting: Driver for Modesetting Kernel Drivers: kms

~~~~~~~~~~~~~~~~~~~~~~

$ ps axu | grep [X]org
root       584  0.2  1.5 222520 52104 tty1     Ss+  04:26   0:04
/usr/libexec/Xorg.bin :0 -config /etc/X11/xorg.conf.nouveau -seat seat0 -auth
/var/run/lightdm/root/:0 -nolisten tcp vt1 -novtswitch
root      1797  0.6  1.1 226756 38024 ?        Sl   04:50   0:01
/usr/libexec/Xorg.bin :1 -seat seat1 -sharevts -auth /var/run/lightdm/root/:1
-nolisten tcp

~~~~~~~~~~~~~~~~~~~~~~~~

$ loginctl list-sessions 
   SESSION        UID USER             SEAT            
        c1        989 lightdm          seat0           
         1       1001 poma             seat0           
        c2        989 lightdm          seat1           
         2       1002 pia              seat1           

4 sessions listed.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ loginctl seat-status seat1 
seat1
        Sessions: *3 c2
         Devices:
                 
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-5/2-5:1.0/sound/card0
                  ? sound:card0 "Set"
                 
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-5/2-5:1.3/0003:0D8C:000C.0003/input/input6
                  ? input:input6 "C-Media USB Headphone Set  "
                 
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-9/2-9:1.0/0003:1997:2433.0004/input/input7
                  ? input:input7 "  Mini Keyboard"
                 
??/sys/devices/pci0000:00/0000:00:04.0/usb2/2-9/2-9:1.1/0003:1997:2433.0005/input/input8
                  ? input:input8 "  Mini Keyboard"
                 
??/sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/drm/card1
                  ? drm:card1
                 
??/sys/devices/pci0000:00/0000:00:04.1/usb1/1-6/1-6:1.0/graphics/fb1
                    [MASTER] graphics:fb1 "udldrmfb"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

$ loginctl seat-status seat0
seat0
        Sessions: *1 c1
         Devices:
                  ...
                  ??/sys/devices/pci0000:00/0000:00:10.0/0000:01:00.0/drm/card0
                  ? drm:card0
                 
??/sys/devices/pci0000:00/0000:00:10.0/0000:01:00.0/drm/renderD128
                  ? drm:renderD128
                 
??/sys/devices/pci0000:00/0000:00:10.0/0000:01:00.0/graphics/fb0
                    [MASTER] graphics:fb0 "nouveaufb"

~~~~~~~~~~~~~~~~~

$ hostnamectl status | grep 'System\|Kernel'
  Operating System: Fedora 22 (Rawhide)
            Kernel: Linux 3.17.0-0.rc3.git0.1.fc22.x86_64

$ rpm -qf /usr/bin/systemctl
systemd-216-3.fc22.x86_64

$ rpm -qf /usr/libexec/Xorg.bin 
xorg-x11-server-Xorg-1.16.0-4.fc22.x86_64

$ rpm -qf /etc/lightdm/lightdm.conf
lightdm-1.11.8-1.fc21.x86_64

$ rpm -qf /etc/lightdm/lightdm-gtk-greeter.conf 
lightdm-gtk-1.9.0-1.fc21.x86_64

$ man 1 systemctl :)


poma