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[Laércio de Sousa <lbsousajr@xxxxxxxxx>]

Robert, there may be a mistake here: "-listen tcp" was first introduced
in xorg-server 1.17.0 (vivid ships with 1.17.1), not 1.16.0.

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https://bugs.launchpad.net/bugs/1449282

Title:
  xserver-allow-tcp features doesn't work with Xorg version 1.16.0

Status in lightdm package in Ubuntu:
  Triaged

Bug description:
  In order to enable X11 forwarding from an external host you must
  explicitly set the Xserver to listen by overriding the xserver-
  command.  Previously you could set the xserver-allow-tcp=true and it
  would do this automatically.

  I would have expected this change in behaviour to show up in
  README.Debian.gz but since it did not, perhaps the functionality of
  the "xserver-allow-tcp=true" is not working as expected.

  Below shows my before (no TCP listener on 6000) and after (TCP
  listener on 6000) lightdm.conf to re-enable the listener after the
  15.04 upgrade.

  Before (14.10):

  ~$ cat /etc/lightdm/lightdm.conf

  [SeatDefaults]
  xserver-allow-tcp=true

  After (15.04):

  ~$ cat /etc/lightdm/lightdm.conf

  [SeatDefaults]
  xserver-command=X -core -listen tcp
  xserver-allow-tcp=true

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: lightdm 1.14.0-0ubuntu2
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Apr 27 17:33:26 2015
  InstallationDate: Installed on 2014-12-18 (130 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  LightdmConfig:
   [SeatDefaults]
   xserver-command=X -core -listen tcp
   xserver-allow-tcp=true
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to vivid on 2015-04-27 (0 days ago)

  ###########################################
  i haven't /etc/lightdm/lightdm.conf
  when i tried to create it and write the lines above it was worse, my system didin't start.
  after a few experiment i have found something that works:
  i change my /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf

  before it was:
  [SeatDefaults]
  # Dump core
  xserver-command=X -core

  now:
  [SeatDefaults]
  # Dump core
  xserver-command=X -core
  xserver-allow-tcp=true

  and it works!

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