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
