Have you seen it happening before? What if you use nouveau?
]]>1. What comes before that message?
2. Is it a laptop? If so, do you have laptop-mode-tools installed?
3. Kernel version? Is you software up-to-date?
the messages before thi error are as below.
Nov 18 18:31:38 chinat dbus-daemon[375]: dbus[375]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbu
Nov 18 18:31:38 chinat dbus[375]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.
Nov 18 18:31:38 chinat systemd[1]: Starting Hostname Service...
Nov 18 18:31:38 chinat dbus-daemon[375]: dbus[375]: [system] Successfully activated service 'org.freedesktop.hostname1'
Nov 18 18:31:38 chinat dbus[375]: [system] Successfully activated service 'org.freedesktop.hostname1'
Nov 18 18:31:38 chinat systemd[1]: Started Hostname Service.
Nov 18 18:33:18 chinat systemd[1]: Starting Cleanup of Temporary Directories...
Nov 18 18:33:18 chinat systemd-tmpfiles[6619]: stat(/run/user/1000/gvfs) failed: Permission denied
Nov 18 18:33:19 chinat systemd[1]: Started Cleanup of Temporary Directories.
Nov 18 18:34:21 chinat sudo[7688]: thinking : TTY=pts/0 ; PWD=/usr/share/applications ; USER=root ; COMMAND=/usr/bin/pacman -Rsc epipha
Nov 18 18:34:21 chinat sudo[7688]: pam_unix(sudo:session): session opened for user root by thinking(uid=0)
Nov 18 18:34:39 chinat sudo[7688]: pam_unix(sudo:session): session closed for user root
Nov 18 18:34:44 chinat sudo[8129]: thinking : TTY=pts/0 ; PWD=/usr/share/applications ; USER=root ; COMMAND=/usr/bin/pacman -Syu
Nov 18 18:34:44 chinat sudo[8129]: pam_unix(sudo:session): session opened for user root by thinking(uid=0)
Nov 18 18:35:15 chinat systemd[1]: Mounting Arbitrary Executable File Formats File System...
Nov 18 18:35:15 chinat systemd[1]: Mounted Arbitrary Executable File Formats File System.
Nov 18 18:35:18 chinat sudo[8129]: pam_unix(sudo:session): session closed for user root
Nov 18 18:37:53 chinat dbus-daemon[375]: dbus[375]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbu
Nov 18 18:37:53 chinat dbus[375]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.
Nov 18 18:37:53 chinat systemd[1]: Starting Hostname Service...
Nov 18 18:37:53 chinat dbus-daemon[375]: dbus[375]: [system] Successfully activated service 'org.freedesktop.hostname1'
Nov 18 18:37:53 chinat dbus[375]: [system] Successfully activated service 'org.freedesktop.hostname1'
Nov 18 18:37:53 chinat systemd[1]: Started Hostname Service.
Nov 18 18:48:58 chinat kernel: NVRM: GPU at 0000:01:00.0 has fallen off the bus.
Nov 18 18:48:59 chinat gnome-session[626]: Gdk-WARNING: The application 'gnome-session' lost its connection to the display :0;
yes, it's laptop, and i didn't install laptop-mode-tools. is it necessary? what's it's job?
my kernel verison is Linux chinat 3.6.6-1-ARCH #1 SMP PREEMPT Mon Nov 5 13:14:42 CET 2012 i686 GNU/Linux, and i think all softwares are up to date.
Nov 18 18:48:58 chinat kernel: NVRM: GPU at 0000:01:00.0 has fallen off the bus.
Nov 18 18:48:59 chinat gnome-session[626]: Gdk-WARNING: The application 'gnome-session' lost its connection to the display :0;
Nov 18 18:48:59 chinat gdm-password][619]: pam_unix(gdm-password:session): session closed for user thinking
Nov 18 18:48:59 chinat gdm-simple-slave[387]: WARNING: Child process 390 was already dead.
Nov 18 18:48:59 chinat gdm-simple-slave[387]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-simple-slave[387]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-network: (3) GDBus.Error:org.freedesktop.DBus.Error.N
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.sleep-wake: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasNoOwne
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-wifi: (3) GDBus.Error:org.freedesktop.DBus.Error.Name
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 comm="/usr/sbin/gdm-binary
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 comm="/usr/sbin/gdm-binary ") interface="org
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-wwan: (3) GDBus.Error:org.freedesktop.DBus.Error.Name
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.enable-disable-wimax: (3) GDBus.Error:org.freedesktop.DBus.Error.Nam
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.network-control: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasN
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.wifi.share.protected: (3) GDBus.Error:org.freedesktop.DBus.Error.Nam
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.wifi.share.open: (3) GDBus.Error:org.freedesktop.DBus.Error.NameHasN
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.system: (3) GDBus.Error:org.freedesktop.DBus.Error.N
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.own: (3) GDBus.Error:org.freedesktop.DBus.Error.Name
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.hostname: (3) GDBus.Error:org.freedesktop.DBus.Error
Nov 18 18:48:59 chinat polkitd[393]: Unregistered Authentication Agent for unix-session:2 (system bus name :1.63, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, l
Nov 18 18:48:59 chinat gdm-simple-slave[23442]: WARNING: Child process 23444 was already dead.
Nov 18 18:48:59 chinat gdm-simple-slave[23442]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-simple-slave[23442]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.197828 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.197828 seconds
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.202064 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.202064 seconds
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 comm="/usr/sbin/gdm-binary
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 comm="/usr/sbin/gdm-binary ") interface="org
Nov 18 18:48:59 chinat gdm-simple-slave[23446]: WARNING: Child process 23448 was already dead.
Nov 18 18:48:59 chinat gdm-simple-slave[23446]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-simple-slave[23446]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.098475 seconds
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.098475 seconds
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.100496 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.100496 seconds
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 comm="/usr/sbin/gdm-binary
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 comm="/usr/sbin/gdm-binary ") interface="org
Nov 18 18:48:59 chinat gdm-simple-slave[23450]: WARNING: Child process 23452 was already dead.
:
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.system: (3)
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.own: (3) GD
Nov 18 18:48:59 chinat NetworkManager[371]: <warn> error requesting auth for org.freedesktop.NetworkManager.settings.modify.hostname: (
Nov 18 18:48:59 chinat polkitd[393]: Unregistered Authentication Agent for unix-session:2 (system bus name :1.63, object path /org/free
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.202064 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.202064 seconds
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3"
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 com
Nov 18 18:48:59 chinat gdm-simple-slave[23446]: WARNING: Child process 23448 was already dead.
Nov 18 18:48:59 chinat gdm-simple-slave[23446]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-simple-slave[23446]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.098475 seconds
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.098475 seconds
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.100496 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.100496 seconds
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3"
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 com
Nov 18 18:48:59 chinat gdm-simple-slave[23450]: WARNING: Child process 23452 was already dead.
Nov 18 18:48:59 chinat gdm-simple-slave[23450]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-simple-slave[23450]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.098075 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.098075 seconds
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3"
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 com
Nov 18 18:48:59 chinat gdm-simple-slave[23455]: WARNING: Child process 23457 was already dead.
Nov 18 18:48:59 chinat gdm-simple-slave[23455]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-simple-slave[23455]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.101658 seconds
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.101658 seconds
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.103567 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.103567 seconds
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3"
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 com
Nov 18 18:48:59 chinat gdm-simple-slave[23459]: WARNING: Child process 23461 was already dead.
Nov 18 18:48:59 chinat gdm-simple-slave[23459]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm-simple-slave[23459]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:48:59 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.107912 seconds
Nov 18 18:48:59 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.107912 seconds
Nov 18 18:48:59 chinat dbus-daemon[375]: dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3"
Nov 18 18:48:59 chinat dbus[375]: [system] Rejected send message, 1 matched rules; type="method_call", sender=":1.3" (uid=0 pid=379 com
Nov 18 18:49:00 chinat gdm-simple-slave[23463]: WARNING: Child process 23466 was already dead.
Nov 18 18:49:00 chinat gdm-simple-slave[23463]: GLib-GObject-CRITICAL: g_object_ref: assertion `object->ref_count > 0' failed
Nov 18 18:49:00 chinat gdm-simple-slave[23463]: GLib-GObject-CRITICAL: g_object_unref: assertion `object->ref_count > 0' failed
Nov 18 18:49:00 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.108835 seconds
Nov 18 18:49:00 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.108835 seconds
Nov 18 18:49:00 chinat gdm[379]: gdm-binary[379]: WARNING: GdmLocalDisplayFactory: maximum number of X display failures reached: check
Nov 18 18:49:00 chinat gdm-binary[379]: WARNING: GdmLocalDisplayFactory: maximum number of X display failures reached: check X server l
Nov 18 18:49:00 chinat gdm[379]: gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.111018 seconds
Nov 18 18:49:00 chinat gdm-binary[379]: WARNING: GdmDisplay: display lasted 0.111018 seconds
Nov 18 18:49:46 chinat systemd-logind[373]: Power key pressed.
Nov 18 18:49:46 chinat systemd-logind[373]: Powering Off...
Nov 18 18:49:46 chinat systemd-logind[373]: System is powering down.
i think the key error is
Nov 18 18:48:58 chinat kernel: NVRM: GPU at 0000:01:00.0 has fallen off the bus.
i must saw this error before. and just before the desktop died, i was just listening music with miro and suffering the internet with chromium.
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