After using my new setup, described in comment #23 above for the whole
day I have some interesting news: whenever X restart in the second seat,
the first seat is kicked out to a black screen and to go back to the its
graphical interface I need to type ALT-F7.

This fact explain the problem I was seeing when the seats start, as X
for second seat is called after X for the first seat.

Unfortunately this makes the day-to-day use of a newer lightdm much more
annoying than I originally thought, as the first seat can be kicked out
to the black screen many times a day.

Even worse, at least twice, when the second seat closed the section the
transition of the first seat to the black screen resulted in X crashing,
completely closing the section for the fist seat (and then ALT-F7 would
take you a to a login screen). This is a very bad behavior as it can
easily lead to data loss for the first seat user.

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Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/976124

Title:
  lightdm multiseat: no login possible

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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