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Bug#852397: marked as done (lightdm does not display a greeter dialog when accessed via XDMCP from a cygwin XWin server)

Your message dated Mon, 20 Aug 2018 20:34:58 +0200
with message-id <f15964562b24849b8f0da8b940521ef78f31c760.camel@debian.org>
and subject line Re: Bug#852397: Problem resolved with latest Cygwin Xorg server
has caused the Debian Bug report #852397,
regarding lightdm does not display a greeter dialog when accessed via XDMCP from a cygwin XWin server
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
852397: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=852397
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: lightdm
Version: 1.18.3-1
I attempt to connect via XDMCP to a machine running Debian Sid/Stretch from a remote cygwin based Xserver. The remote session starts and displays a black screen with nothing but a mouse cursor in the very middle. The mouse cursor then jumps to the upper left corner of the screen and nothing further happens. I am expecting to see the lightdm greeter which never appears. I have several other machines running Debian Jessie and Debian Wheezy and can connect to them with no problems. I have two machines running Sid/Stretch and I can't connect to either. The problem is specific to Sid/Stretch and I would classify it as a regression.
I have included the lightdm greeter error log, /var/log/lightdm/(null)-greeter.log, from the Sid/Stretch machine below. The WARNING related to the upstart command and the WARNING related to negative dimensions are present in the greeter log for the physical monitor/keyboard so I guess that they are not related to the problem. I would guess that the problem lies with the gdk_pixbuf calls.
I have also included the lightdm greeter log from a successful connection to a Debian Jessie machine even further below. Note that the name of the greeter log file is "x-192.168.1.50-0-greeter.log" for a successful connection and "(null)-greeter.log" for an unsuccessful connection. Perhaps the name difference is related to the problem.
I don't know enough about the various pieces of this puzzle so I don't know if I should file this bug against Debian or cygwin. I'm thinking somehow that I shouldn't have to make changes to my Xserver to connect to a Sid/Stretch machine when I can connect just fine to Jessie and Wheezy machines with the same Xserver.
The problem machines are running freshly updated/upgraded Debian Sid/Stretch: /etc/debian_version 9.0 


Unsuccessful greeter log from Debian Sid/Stretch machine:

root@dn2800mt2:/var/log/lightdm# cat \(null\)-greeter.log
** Message: Starting lightdm-gtk-greeter 2.0.2 (Nov 16 2016, 20:48:17)
** Message: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_debian.conf ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf 
Activating service name='org.a11y.atspi.Registry'
Successfully activated service 'org.a11y.atspi.Registry'
** (lightdm-gtk-greeter:1422): WARNING **: [PIDs] Failed to execute command: upstart
(lightdm-gtk-greeter:1422): GdkPixbuf-CRITICAL **: gdk_pixbuf_new: assertion 'width > 0' failed
(lightdm-gtk-greeter:1422): GdkPixbuf-CRITICAL **: gdk_pixbuf_composite: assertion 'GDK_IS_PIXBUF (dest)' failed
(lightdm-gtk-greeter:1422): GLib-GObject-CRITICAL **: g_object_ref: assertion 'G_IS_OBJECT (object)' failed
** (lightdm-gtk-greeter:1422): WARNING **: [Background] Failed to read wallpaper: /usr/share/images/desktop-base/login-background.svg
(lightdm-gtk-greeter:1422): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
(lightdm-gtk-greeter:1422): Gtk-WARNING **: Drawing a gadget with negative dimensions. Did you forget to allocate a size? (node menubar owner GreeterMenuBar) Gdk-Message: lightdm-gtk-greeter: Fatal IO error 11 (Resource temporarily unavailable) on X server 192.168.1.50:0. 


Successful greeter log from Debian Jessie machine:

root@dn2800mt:/var/log/lightdm# cat x-192.168.1.50-0-greeter.log
(lightdm-gtk-greeter:1686): Gtk-CRITICAL **: gtk_container_foreach: assertion 'GTK_IS_CONTAINER (container)' failed
(lightdm-gtk-greeter:1686): Gtk-CRITICAL **: gtk_container_foreach: assertion 'GTK_IS_CONTAINER (container)' failed
(lightdm-gtk-greeter:1686): Gtk-CRITICAL **: gtk_container_foreach: assertion 'GTK_IS_CONTAINER (container)' failed
--- End Message ---
--- Begin Message --- 
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On Fri, 2018-08-10 at 16:45 -0700, Paul Ausbeck wrote:
> I recently tested connecting to Debian Stretch from Debian Jessie via XDMCP
> and had no problems. That and the passage of time led me to look to see if a
> newer Xorg server was available from Cygwin and there was. I just downloaded
> the latest Cygwin Xorg server, version 1.20, and it connects to Debian
> Stretch via XDMCP just fine. Therefore, I consider the problem to now be
> resolved.

Thanks for the update, I'm closing the bug then.

Regards,
- -- 
Yves-Alexis
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