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My desktop just froze and I could not press any keys.

When I tried CTRL+ALT+F1 I got logged out from my gnome session and the
graphical (!) login window appeared.

There's some messages in my syslog, e.g. gdk-warning gnome-session fatal
io error 11 (resource temporarily unavailable) on x server

Plus, the syslog indicates that dbus service has gone ("Unable to
contact D-Bus").

Processor: Intel i5 520M
Display: 
        *-display
             Beschreibung: VGA compatible controller
             Produkt: Core Processor Integrated Graphics Controller
             Hersteller: Intel Corporation
             Physische ID: 2
             Bus-Informationen: pci@0000:00:02.0
             Version: 02
             Breite: 64 bits
             Takt: 33MHz
             Fähigkeiten: msi pm vga_controller bus_master cap_list rom
             Konfiguration: driver=i915 latency=0
             Ressourcen: irq:26 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:8080(Größe=8)


May be related: https://bugs.freedesktop.org/show_bug.cgi?id=92505

Mar  1 07:05:55 lat61 gnome-session[3946]: Gdk-WARNING: gnome-session: Fatal IO error 11 (Die Ressource ist zur Zeit nicht verfügbar) on X server :0.#012
Mar  1 07:05:55 lat61 bluetoothd[1931]: Endpoint unregistered: sender=:1.62 path=/MediaEndpoint/HFPAG
Mar  1 07:05:55 lat61 bluetoothd[1931]: Endpoint unregistered: sender=:1.62 path=/MediaEndpoint/HFPHS
Mar  1 07:05:55 lat61 bluetoothd[1931]: Endpoint unregistered: sender=:1.62 path=/MediaEndpoint/A2DPSource
Mar  1 07:05:55 lat61 bluetoothd[1931]: Endpoint unregistered: sender=:1.62 path=/MediaEndpoint/A2DPSink
Mar  1 07:05:55 lat61 bluetoothd[1931]: hci0: Remove UUID (0x0011) failed: Busy (0x0a)
Mar  1 07:05:55 lat61 colord: device removed: xrandr-eDP1
Mar  1 07:05:55 lat61 colord: Profile removed: icc-e45d9840cbe35d110970eaeda5e0962a
Mar  1 07:05:55 lat61 colord: Profile removed: icc-c84991a3ae2b0aeec63c6e75ebdeff52
Mar  1 07:05:55 lat61 colord: Profile removed: icc-54e2f468d87b8e30fdd2bd2a278fd0bc
Mar  1 07:05:55 lat61 acpid: client 2681[0:0] has disconnected
Mar  1 07:05:55 lat61 kernel: [540289.175127] dell_wmi: Unknown WMI event type 0x11: 0xffd0
Mar  1 07:05:56 lat61 pulseaudio[19042]: [pulseaudio] client-conf-x11.c: xcb_connection_has_error() liefert »true«
Mar  1 07:05:56 lat61 rtkit-daemon[3048]: Successfully made thread 19047 of process 19047 (n/a) owned by '1000' high priority at nice level -11.
Mar  1 07:05:56 lat61 rtkit-daemon[3048]: Supervising 1 threads of 1 processes of 1 users.
Mar  1 07:05:56 lat61 pulseaudio[19047]: [pulseaudio] pid.c: Stale PID file, overwriting.
Mar  1 07:05:56 lat61 rtkit-daemon[3048]: Successfully made thread 19051 of process 19047 (n/a) owned by '1000' RT at priority 5.
Mar  1 07:05:56 lat61 rtkit-daemon[3048]: Supervising 2 threads of 1 processes of 1 users.
Mar  1 07:05:56 lat61 rtkit-daemon[3048]: Successfully made thread 19052 of process 19047 (n/a) owned by '1000' RT at priority 5.
Mar  1 07:05:56 lat61 rtkit-daemon[3048]: Supervising 3 threads of 1 processes of 1 users.
Mar  1 07:05:56 lat61 pulseaudio[19047]: [pulseaudio] server-lookup.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-a4J0kF4Rxq: Verbindungsaufbau abgelehnt
Mar  1 07:05:56 lat61 pulseaudio[19047]: [pulseaudio] main.c: Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /tmp/dbus-a4J0kF4Rxq: Verbindungsaufbau abgelehnt
Mar  1 07:05:56 lat61 bluetoothd[1931]: Endpoint registered: sender=:1.228 path=/MediaEndpoint/HFPAG
Mar  1 07:05:56 lat61 bluetoothd[1931]: Endpoint registered: sender=:1.228 path=/MediaEndpoint/HFPHS
Mar  1 07:05:56 lat61 bluetoothd[1931]: Endpoint registered: sender=:1.228 path=/MediaEndpoint/A2DPSource
Mar  1 07:05:56 lat61 bluetoothd[1931]: Endpoint registered: sender=:1.228 path=/MediaEndpoint/A2DPSink
Mar  1 07:05:56 lat61 pulseaudio[19047]: [pulseaudio] module-bluetooth-device.c: Default profile not connected, selecting off profile
Mar  1 07:05:57 lat61 kernel: [540290.346424] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
Mar  1 07:05:57 lat61 kernel: [540290.346455] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
Mar  1 07:05:57 lat61 acpid: input device has been disconnected, fd 13
Mar  1 07:05:57 lat61 kernel: [540290.703007] dell_wmi: Unknown WMI event type 0x11: 0xffd1

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-4.2.0-30-generic 4.2.0-30.36~14.04.1
ProcVersionSignature: Ubuntu 4.2.0-30.35~14.04.1-generic 4.2.8-ckt3
Uname: Linux 4.2.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar  1 07:18:37 2016
InstallationDate: Installed on 2014-11-29 (458 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: linux-lts-wily
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug trusty
-- 
gnome-session logs out with Fatal IO error 11
https://bugs.launchpad.net/bugs/1551566
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