Does NOT work for me :-( I'm still getting the "no screens found" error, which, if I understand correctly, is supposed to be fixed with: http://bazaar.launchpad.net/~ubuntu-multiseat/xorg-server/trusty-matchseat/revision/287/debian/patches/xfree86_allow_fallback_to_pci_bus_probe_for_non_seat0.patch $ cat /etc/apt/sources.list deb http://archive.ubuntu.com/ubuntu/ trusty-proposed restricted main multiverse universe deb http://pl.archive.ubuntu.com/ubuntu trusty-updates restricted universe main multiverse deb http://security.ubuntu.com/ubuntu/ trusty-security restricted universe main multiverse deb http://pl.archive.ubuntu.com/ubuntu trusty main restricted universe multiverse $ dpkg -l xserver-xorg-core ... ii xserver-xorg-core 2:1.15.1-0ubuntu2.6 $ lspci | grep VGA 01:00.0 VGA compatible controller: NVIDIA Corporation G98 [GeForce 8400 GS Rev. 2] (rev a1) 03:00.0 VGA compatible controller: NVIDIA Corporation G86 [Quadro NVS 290] (rev a1) $ cat /etc/udev/rules.d/99-multiseat.rules SUBSYSTEM=="drm", KERNEL=="card[0-9]*", ATTRS{vendor}=="0x10de", TAG+="master-of-seat" TAG=="seat", DEVPATH=="/devices/pci0000:00/0000:00:01.0/0000:01:00.0/*", ENV{ID_SEAT}="seat0", TAG+="seat0" TAG=="seat", DEVPATH=="/devices/pci0000:00/0000:00:1c.2/0000:03:00.0/*", ENV{ID_SEAT}="seat-1", TAG+="seat-1" TAG=="seat", SUBSYSTEM=="usb", ATTR{name}=="DELL Dell USB Entry Keyboard", ENV{ID_SEAT}="seat0", TAG+="seat0" TAG=="seat", SUBSYSTEM=="usb", ATTR{name}=="Logitech USB-PS/2 Optical Mouse", ENV{ID_SEAT}="seat0", TAG+="seat0" TAG=="seat", SUBSYSTEM=="input", ATTR{name}=="AT Translated Set 2 keyboard", ENV{ID_SEAT}="seat-1", TAG+="seat-1" TAG=="seat", SUBSYSTEM=="input", ATTR{name}=="ImPS/2 Generic Wheel Mouse", ENV{ID_SEAT}="seat-1", TAG+="seat-1" $ loginctl list-seats SEAT seat0 seat-1 2 seats listed. $ loginctl show-seat seat0 Id=seat0 ActiveSession=c2 CanMultiSession=yes CanTTY=yes CanGraphical=yes Sessions=c2 IdleHint=no IdleSinceHint=0 IdleSinceHintMonotonic=0 $ loginctl show-seat seat-1 Id=seat-1 CanMultiSession=no CanTTY=no CanGraphical=yes IdleHint=yes IdleSinceHint=0 IdleSinceHintMonotonic=0 $ loginctl list-sessions SESSION UID USER SEAT c2 1000 andrzejtp seat0 1 sessions listed. $ loginctl seat-status seat0 seat0 Sessions: *c2 Devices: /sys/devices/LNXSYSTM:00/LNXPWRBN:00/input/input1 input:input1 "Power Button" /sys/devices/LNXSYSTM:00/device:00/PNP0C0C:00/input/input0 input:input0 "Power Button" /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0 [MASTER] drm:card0 /sys/devices/pci0000:00/0000:00:1a.0/usb3 usb:usb3 /sys/devices/pci0000:00/0000:00:1a.1/usb4 usb:usb4 /sys/devices/pci0000:00/0000:00:1a.2/usb5 usb:usb5 /sys/devices/pci0000:00/0000:00:1a.7/usb1 usb:usb1 /sys/devices/pci0000:00/0000:00:1b.0/sound/card0 sound:card0 "Intel" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input10 input:input10 "HDA Intel Line Out CLFE" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input11 input:input11 "HDA Intel Line Out Side" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input12 input:input12 "HDA Intel Front Headphone" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input5 input:input5 "HDA Intel Rear Mic" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input6 input:input6 "HDA Intel Front Mic" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input7 input:input7 "HDA Intel Line" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input8 input:input8 "HDA Intel Line Out Front" /sys/devices/pci0000:00/0000:00:1b.0/sound/card0/input9 input:input9 "HDA Intel Line Out Surround" /sys/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/ata5/host4/target4:0:0/4:0:0:0/block/sr0 block:sr0 /sys/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/ata5/host4/target4:0:0/4:0:0:0/scsi_generic/sg1 scsi_generic:sg1 /sys/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/ata5/host4/target4:0:1/4:0:1:0/block/sr1 block:sr1 /sys/devices/pci0000:00/0000:00:1c.4/0000:04:00.0/ata5/host4/target4:0:1/4:0:1:0/scsi_generic/sg2 scsi_generic:sg2 /sys/devices/pci0000:00/0000:00:1d.0/usb6 usb:usb6 /sys/devices/pci0000:00/0000:00:1d.1/usb7 usb:usb7 /sys/devices/pci0000:00/0000:00:1d.2/usb8 usb:usb8 /sys/devices/pci0000:00/0000:00:1d.2/usb8/8-1/8-1:1.0/input/input13 input:input13 "DELL Dell USB Entry Keyboard" /sys/devices/pci0000:00/0000:00:1d.2/usb8/8-2/8-2:1.0/input/input14 input:input14 "Logitech USB-PS/2 Optical Mouse" /sys/devices/pci0000:00/0000:00:1d.7/usb2 usb:usb2 /sys/devices/pci0000:00/0000:00:1e.0/0000:06:00.0/video4linux/vbi0 video4linux:vbi0 "BT878 vbi ( *** UNKNOWN/GENERIC" /sys/devices/pci0000:00/0000:00:1e.0/0000:06:00.0/video4linux/video0 video4linux:video0 "BT878 video ( *** UNKNOWN/GENER" /sys/devices/virtual/misc/rfkill misc:rfkill $ loginctl seat-status seat-1 seat-1 Devices: /sys/devices/pci0000:00/0000:00:1c.2/0000:03:00.0/drm/card1 [MASTER] drm:card1 /sys/devices/platform/i8042/serio0/input/input2 input:input2 "AT Translated Set 2 keyboard" /sys/devices/platform/i8042/serio1/input/input4 input:input4 "ImPS/2 Generic Wheel Mouse" $ lsmod | grep nouveau $ lsmod | grep nvidia nvidia 9704610 58 drm 244037 3 nvidia $ cat /etc/lightdm/lightdm.conf [LightDM] logind-load-seats=true logind-check-graphical=true # cat /var/log/lightdm/x-1.log X.Org X Server 1.15.1 Release Date: 2014-04-13 X Protocol Version 11, Revision 0 Build Operating System: Linux 3.2.0-70-generic i686 Ubuntu Current Operating System: Linux turbo 3.13.0-43-generic #72-Ubuntu SMP Mon Dec 8 19:35:44 UTC 2014 i686 Kernel command line: BOOT_IMAGE=/vmlinuz root=/dev/sda1 nomodeset Build Date: 10 December 2014 06:16:10PM xorg-server 2:1.15.1-0ubuntu2.6 (For technical support please see http://www.ubuntu.com/support) Current version of pixman: 0.30.2 Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. (==) Log file: "/var/log/Xorg.1.log", Time: Sat Dec 13 19:25:33 2014 (==) Using system config directory "/usr/share/X11/xorg.conf.d" Initializing built-in extension Generic Event Extension Initializing built-in extension SHAPE Initializing built-in extension MIT-SHM Initializing built-in extension XInputExtension Initializing built-in extension XTEST Initializing built-in extension BIG-REQUESTS Initializing built-in extension SYNC Initializing built-in extension XKEYBOARD Initializing built-in extension XC-MISC Initializing built-in extension SECURITY Initializing built-in extension XINERAMA Initializing built-in extension XFIXES Initializing built-in extension RENDER Initializing built-in extension RANDR Initializing built-in extension COMPOSITE Initializing built-in extension DAMAGE Initializing built-in extension MIT-SCREEN-SAVER Initializing built-in extension DOUBLE-BUFFER Initializing built-in extension RECORD Initializing built-in extension DPMS Initializing built-in extension Present Initializing built-in extension DRI3 Initializing built-in extension X-Resource Initializing built-in extension XVideo Initializing built-in extension XVideo-MotionCompensation Initializing built-in extension SELinux Initializing built-in extension XFree86-VidModeExtension Initializing built-in extension XFree86-DGA Initializing built-in extension XFree86-DRI Initializing built-in extension DRI2 Loading extension GLX (EE) Fatal server error: (EE) no screens found(EE) (EE) Please consult the The X.Org Foundation support at http://wiki.x.org for help. (EE) Please also check the log file at "/var/log/Xorg.1.log" for additional information. (EE) (EE) Server terminated with error (1). Closing log file. On the other hand, if I use nouveau, both seats come up, but once a demanding application (like firefox) is started at seat-1, screen quickly becomes full of garbage and in dmes I can see many lines like: Dec 13 17:20:28 turbo kernel: [ 2788.000175] nouveau E[ PGRAPH][0000:03:00.0] ch 2 [0x000fb43000 Xorg[21316]] subc 0 class 0x0030 mthd 0x0224 data 0x00000140 Dec 13 17:20:28 turbo kernel: [ 2788.000193] nouveau E[ PGRAPH][0000:03:00.0] ILLEGAL_MTHD. To conclude this lengthy post: either I have both seats but one unusable (with nouveau), or I have just one seat working properly while the other gets "no screens found" (with nvidia).