Another thing you could try is assign everything to seat1 and see if you can get just seat 1 to start:
99-multiseat.rules: TAG=="seat", ENV{ID_SEAT}="seat1", TAG+="seat1" TAG=="seat", DEVPATH=="/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/*", TAG+="master-of-seat" lightdm.conf: [SeatDefaults] user-session=ubuntu greeter-session=unity-greeter user-authority-in-system-dir=true [Seat:1] xdg-seat=seat1 xserver-command=/usr/bin/X -core -config xorg-seat1.conf -layout Seat1 -s 120 -isolateDevice PCI:2:0:0 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/976124 Title: lightdm multiseat: no login possible Status in Light Display Manager: In Progress Status in “lightdm” package in Ubuntu: In Progress Status in “lightdm” source package in Precise: Confirmed Bug description: I am testing a multiseat setup with precise: One XServer is running on intel graphics card, a second one is running on a DisplayLink (usb video) device. The two greeters are displayed, but without password fields shown so it is not possible to login. If auto-login is enabled in lightdm.conf multiseat works fine. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: lightdm 1.2.0-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-22.35-generic 3.2.14 Uname: Linux 3.2.0-22-generic x86_64 ApportVersion: 2.0-0ubuntu4 Architecture: amd64 Date: Sat Apr 7 20:35:52 2012 InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328) ProcEnviron: PATH=(custom, no user) LANG=de_DE.UTF-8 SHELL=/bin/bash SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/lightdm/+bug/976124/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp