> But maybe you have some ideas where or what we need to fix?

A potential conflict with PAM settings was my best idea, but that
doesn't seem likely anymore.

> I was able to login in both seats two times today, but I have no
> idea what could caused that

Interesting!  That could indicate a race condition. Try delaying the
start of X on your second seat to see if that helps.

First, create a wrapper script around X that pauses before starting X:

sudo tee /usr/bin/Xdelayed <<EOF >/dev/null
#!/bin/sh
sleep 10
exec /usr/bin/X "$@"
EOF
sudo chmod a+rx /usr/bin/Xdelayed

Next, modify your second seat config in /etc/lightdm/lightdm.conf to use
the wrapper script:

[Seat:1]
xserver-vt=0
xdg-seat=seat1
xserver-command=/usr/bin/Xdelayed <whatever arguments you usually use>

Finally, restart lightdm (sudo service lightdm restart) or reboot and
see what happens.

(I know you know how to create scripts and restart lightdm and whatnot,
I'm just trying to be detailed for the benefit of the lurkers reading
this bug report.)

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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:
  Confirmed
Status in “lightdm” package in Ubuntu:
  Confirmed
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)

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