libgnome-desktop/gnome-rr.c::gnome_rr_screen_new() says:
* Returns: a unique #GnomeRRScreen instance, specific to the @screen, or NULL
* if this could not be created, for instance if the driver does not support
* Xrandr 1.2. Each #GdkScreen thus has a single instance of #GnomeRRScreen.
therefore in gnome-control-center panels/display/cc-diaply-
panel.c::cc_display_panel_constructor() the following code is incorrect:
self->priv->screen = gnome_rr_screen_new (gdk_screen_get_default (), &error);
g_signal_connect (self->priv->screen, "changed", G_CALLBACK
(on_screen_changed), self);
if (!self->priv->screen)
{
error_message (NULL, _("Could not get screen information"),
error->message);
g_error_free (error);
if the call to gnome_rr_screen_new() returns NULL, as it will if no
RANDR is available, the subsequent setup of the signal:
g_signal_connect (self->priv->screen, "changed", G_CALLBACK
(on_screen_changed), self);
is done with self->priv->screen == NULL
So when that signal fires it passes a NULL screen pointer to
on_screen_changed(). Passing the NULL pointer doesn't matter since it
isn't used in the call-back, but self->priv->screen is used:
on_screen_changed (GnomeRRScreen *scr,
gpointer data)
{
GnomeRRConfig *current;
CcDisplayPanel *self = data;
current = gnome_rr_config_new_current (self->priv->screen, NULL);
gnome_rr_config_ensure_primary (current);
So current will be NULL after calling gnome_rr_config_new_current()
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/979959
Title:
"gnome-control-center display" crashes if no RANDR extension
Status in “gnome-control-center” package in Ubuntu:
New
Bug description:
The problem can be reproduced at will by clicking on display settings
icon, but also by typing this :
gnome-control-center display
A window appears, complains "Could not get screen information" "RANDR
extension is not present".
$ LC_ALL=C gnome-control-center display
(gnome-control-center:13078): Gtk-WARNING **: GtkTable does not have a
property called expand
(gnome-control-center:13078): Gtk-WARNING **: GtkTable does not have a
property called fill
(gnome-control-center:13078): Gtk-WARNING **: GtkTable does not have a
property called position
(gnome-control-center:13078): GLib-GObject-WARNING **: invalid (NULL)
pointer instance
(gnome-control-center:13078): GLib-GObject-CRITICAL **:
g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Erreur de segmentation (core dumped)
ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.0-0ubuntu6
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu2
Architecture: amd64
Date: Thu Apr 12 16:41:38 2012
ExecutablePath: /usr/bin/gnome-control-center
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120410)
ProcCmdline: gnome-control-center --overview
ProcEnviron:
PATH=(custom, user)
LANG=fr_FR.UTF-8
SHELL=/bin/bash
SegvAnalysis:
Segfault happened at: 0x7fb28dcb7c07 <gtk_widget_size_allocate+23>: mov
0x18(%rdi),%rbp
PC (0x7fb28dcb7c07) ok
source "0x18(%rdi)" (0x00000018) not located in a known VMA region (needed
readable region)!
destination "%rbp" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-control-center
StacktraceTop:
gtk_widget_size_allocate () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
?? () from /usr/lib/libgnome-control-center.so.1
g_cclosure_marshal_VOID__BOXEDv () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: gnome-control-center crashed with SIGSEGV in gtk_widget_size_allocate()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
usr_lib_gnome-control-center:
activity-log-manager-control-center 0.9.4-0ubuntu3
deja-dup 22.0-0ubuntu2
gnome-bluetooth 3.2.2-0ubuntu5
indicator-datetime 0.3.94-0ubuntu1
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