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[a7x <976124@xxxxxxxxxxxxxxxxxx>]

> First message in second seat greeter log file is logged after less
> than 1 second when I log in in first seat. At this moment greeter
> starts eating cpu.

Please attach a debugger and get a stack trace when this happens.

>> Does the greeter crash, exit, or move to the background?
> 
> Greeter crashes.

Please get a stack trace, either by looking at the core file or by
attaching a debugger before it crashes.

> * Tried several times restart pc, but unity-greeter didn't start on
>   my seat. Seat with autologin still worked fine. Than I edited
>   /var/lib/lightdm/.cache/unity-greeter/seat0-state and changed
>   last-user back to what I use on my first seat.

unity-greeter runs some code whenever a user is selected (including
selecting the last logged-in user when unity-greeter starts up).  For
example, it does some PAM stuff to see if a password is required for
the user that was selected.  Something in this code must be crashing.

In addition to the stack traces, please collect the following
information (before logging in via unity-greeter, so use Ctrl-Alt-F1
to log in via a VT or ssh into the machine):

  * unity-greeter environment variables:

    for pid in $(pidof unity-greeter); do
        printf '\n%s\n---------\n' "pid $pid"
        sudo cat /proc/$pid/environ | tr '\0' '\n'
    done >>unity-greeter-environ.txt

  * unity-greeter session processes:  For each session listed in
    'loginctl list-sessions', do:

    loginctl --full --no-pager session-status $session_name
>>sessions.txt

-- 
You received this bug notification because you are a member of Ubuntu
Multiseat, which is subscribed to the bug report.
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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