> Patched xorg with this
> (https://bugzilla.redhat.com/attachment.cgi?id=751266&action=diff)
> patch from this
> (https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=962907)
> bug report. And now lightdm shows up on second seat. Calvin Morrow
> says that fix probably even simplier, read comment #20.

Good find!  Perhaps I'll upload the patched X to my PPA.

> But multiseat still doesn't work. I can login only in one of two
> seats. Pasword field disappears when I want select other user for
> second seat. Or if correct user already is selected, I can write in
> password, but nothing happens when i try to login.

So my multiseat changes don't appear to affect this particular bug.
That's unfortunate.

I know that when selecting a user, LightDM (or maybe it's
unity-greeter, I can't remember) does some PAM stuff to see if it's
possible to log in without a password.  Perhaps you have an uncommon
PAM setup that is confusing LightDM/unity-greeter?

> *) Tested with different seat names. First seat - seat01, second
> seat - seat1. Added udev rules to assign video card and usb hub for
> seat01. Both seats started up, i was able to login in first seat,
> but there was problems - huge memory leaks. In attached zip are log
> files for xorg and lightdm. My .xsession-errors was full of error
> lines:

I'll take a look when I next have the time.

> loginctl list-seats lists only one seat. shouldn't it list two
> seats?

Yes, it should.  If I understand correctly, the 'master-of-seat' udev
tag should cause logind to create the second seat.  (To avoid starting
an X server before a video card is detected, logind won't create a
seat until a device tagged with 'master-of-seat' appears.)  Does
'udevadmin info --export-db' show the 'master-of-seat' tag on your
video card?

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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:
  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)

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