Full backtrace:

Breakpoint 1, gdk_x_error (display=0x1fc5b80, error=0x7fff3ae82470)
    at /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkmain-x11.c:438
438     /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkmain-x11.c: No such file or directory.
        in /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkmain-x11.c
(gdb) bt
#0  gdk_x_error (display=0x1fc5b80, error=0x7fff3ae82470)
    at /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkmain-x11.c:438
#1  0x00007f3f31f1f091 in xkl_process_error () from /usr/lib/libxklavier.so.15
#2  0x00007f3f3b2e4414 in _XError (dpy=0x1fc5b80, rep=0x207e8d0)
    at ../../src/XlibInt.c:2924
#3  0x00007f3f3b2ea89c in process_responses (dpy=0x1fc5b80,
    wait_for_first_event=<value optimized out>,
    current_error=<value optimized out>, current_request=5159)
    at ../../src/xcb_io.c:207
#4  0x00007f3f3b2eaf40 in _XReply (dpy=0x1fc5b80, rep=0x7fff3ae82650, extra=0,
    discard=0) at ../../src/xcb_io.c:457
#5  0x00007f3f3a26825b in XRRSetCrtcConfig (dpy=0x1fc5b80,
    resources=0x20e0c00, crtc=58, timestamp=235837469, x=0,
    y=<value optimized out>, mode=67, rotation=1, outputs=0x20df040,
    noutputs=1) at ../../src/XrrCrtc.c:147
#6  0x00007f3f3614beb0 in gnome_rr_crtc_set_config_with_time (crtc=0x20de590,
    timestamp=837978568, x=<value optimized out>, y=<value optimized out>,
    mode=0x20deb10, rotation=<value optimized out>, outputs=0x2077250,
    n_outputs=1, error=0x7fff3ae82868) at gnome-rr.c:1279
#7  0x00007f3f3614e699 in configure_crtc (key=0x1fc5b80,
    value=<value optimized out>, data=0x7fff3ae827f0) at gnome-rr-config.c:1761
#8  0x00007f3f3bd8ed03 in IA__g_hash_table_foreach (hash_table=0x20e0800,
    func=0x7f3f3614e650 <configure_crtc>, user_data=0x7fff3ae827f0)
---Type <return> to continue, or q <return> to quit---
    at /build/buildd/glib2.0-2.22.2/glib/ghash.c:1211
#9  0x00007f3f3614eb2d in crtc_assignment_apply (config=<value optimized out>,
    screen=<value optimized out>, timestamp=<value optimized out>,
    error=0x7fff3ae82868) at gnome-rr-config.c:2045
#10 gnome_rr_config_apply_with_time (config=<value optimized out>,
    screen=<value optimized out>, timestamp=<value optimized out>,
    error=0x7fff3ae82868) at gnome-rr-config.c:1418
#11 0x00007f3f36360504 in ?? ()
   from /usr/lib/gnome-settings-daemon-2.0/libxrandr.so
#12 0x00007f3f3e6b2474 in gdk_event_apply_filters (
    display=<value optimized out>, event=0x207e590, xevent=0x7fff3ae82a80,
    return_exposes=<value optimized out>)
#13 gdk_event_translate (display=<value optimized out>, event=0x207e590,
    xevent=0x7fff3ae82a80, return_exposes=<value optimized out>)
    at /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkevents-x11.c:1025
#14 0x00007f3f3e6b3868 in _gdk_events_queue (display=0x1fd5000)
    at /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkevents-x11.c:2302
#15 0x00007f3f3e6b3cae in gdk_event_dispatch (source=<value optimized out>,
    callback=0x7fff3ae82470, user_data=0x0)
    at /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkevents-x11.c:2363
#16 0x00007f3f3bd9dbbe in g_main_dispatch (context=0x1fdeb00)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:1960
---Type <return> to continue, or q <return> to quit---
#17 IA__g_main_context_dispatch (context=0x1fdeb00)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2513
#18 0x00007f3f3bda1588 in g_main_context_iterate (context=0x1fdeb00,
    block=<value optimized out>, dispatch=<value optimized out>,
    self=<value optimized out>)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2591
#19 0x00007f3f3bda19e5 in IA__g_main_loop_run (loop=0x2079570)
    at /build/buildd/glib2.0-2.22.2/glib/gmain.c:2799
#20 0x00007f3f3ea3f0e7 in IA__gtk_main ()
    at /build/buildd/gtk+2.0-2.18.2/gtk/gtkmain.c:1216
#21 0x00000000004046a5 in main ()
(gdb) quit