Breakpoint 1, gnome_rr_output_info_get_geometry (self=0x1, x=0x4000000000000000, y=0x0, width=0xc000000000000000, height=0x0) at gnome-rr-output-info.c:106
106     in gnome-rr-output-info.c
(gdb) bt
#0  gnome_rr_output_info_get_geometry (self=0x1, x=0x4000000000000000, y=0x0, width=0xc000000000000000, height=0x0) at gnome-rr-output-info.c:106
#1  0x00007fffee18e909 in compare_output_positions (a=0x7c97f0, b=0x7c97f8) at gsd-xrandr-manager.c:1059
#2  0x00007ffff61d8282 in msort_with_tmp (p=0x7fffffffd3e0, b=0x7c97f0, n=2) at msort.c:83
#3  0x00007ffff61d85cc in msort_with_tmp (n=2, b=0x7c97f0, p=0x7fffffffd3e0) at msort.c:45
#4  __GI_qsort_r (b=0x7c97f0, n=2, s=<optimized out>, cmp=0x7fffee18e8c7 <compare_output_positions>, arg=<optimized out>) at msort.c:297
#5  0x00007fffee18ea84 in trim_rightmost_outputs_that_dont_fit_in_framebuffer (rr_screen=0x7e8990, config=0x7aa730) at gsd-xrandr-manager.c:1100
#6  0x00007fffee18ed7f in make_xinerama_setup (manager=0x7aa630, screen=0x7e8990) at gsd-xrandr-manager.c:1175
#7  0x00007fffee190184 in make_default_setup (manager=0x7aa630) at gsd-xrandr-manager.c:1711
#8  0x00007fffee19076f in apply_default_boot_configuration (mgr=0x7aa630, timestamp=0) at gsd-xrandr-manager.c:1912
#9  0x00007fffee190ca7 in gsd_xrandr_manager_start (manager=0x7aa630, error=0x7fffffffd5a0) at gsd-xrandr-manager.c:2088
#10 0x00007fffee18c902 in impl_activate (plugin=0x72ab30) at gsd-xrandr-plugin.c:29
#11 0x0000000000405bb9 in gnome_settings_plugin_activate (plugin=0x72ab30) at gnome-settings-plugin.c:52
#12 0x0000000000406b43 in _activate_plugin (info=0x62ec80) at gnome-settings-plugin-info.c:408
#13 0x0000000000406c6d in gnome_settings_plugin_info_activate (info=0x62ec80) at gnome-settings-plugin-info.c:431
#14 0x0000000000404c4b in maybe_activate_plugin (info=0x62ec80, user_data=0x0) at gnome-settings-manager.c:95
#15 0x00007ffff67e59ee in g_slist_foreach (list=0x6a7fb0, func=0x404c20 <maybe_activate_plugin>, user_data=0x0) at gslist.c:896
#16 0x000000000040535c in _load_all (manager=0x6c1cc0) at gnome-settings-manager.c:321
#17 0x000000000040561e in gnome_settings_manager_start (manager=0x6c1cc0, error=0x7fffffffd730) at gnome-settings-manager.c:408
#18 0x000000000040414f in start_settings_manager () at main.c:151
#19 0x00000000004047d1 in name_acquired_handler (connection=0x63a030, name=0x6d71a0 "org.gnome.SettingsDaemon", user_data=0x0) at main.c:358
#20 0x00007ffff6e2407c in actually_do_call (client=0x6d7120, connection=0x63a030, call_type=CALL_TYPE_NAME_ACQUIRED) at gdbusnameowning.c:155
#21 0x00007ffff6e24253 in do_call (client=0x6d7120, call_type=CALL_TYPE_NAME_ACQUIRED) at gdbusnameowning.c:215
#22 0x00007ffff6e242bd in call_acquired_handler (client=0x6d7120) at gdbusnameowning.c:229
#23 0x00007ffff6e24524 in request_name_cb (source_object=0x63a030, res=0x692f10, user_data=0x6d7120) at gdbusnameowning.c:327
#24 0x00007ffff6da628b in g_simple_async_result_complete (simple=0x692f10) at gsimpleasyncresult.c:777
#25 0x00007ffff6e18f62 in g_dbus_connection_call_done (source=0x63a030, result=0x7dc020, user_data=0x720a40) at gdbusconnection.c:5339
#26 0x00007ffff6da628b in g_simple_async_result_complete (simple=0x7dc020) at gsimpleasyncresult.c:777
#27 0x00007ffff6da62c1 in complete_in_idle_cb (data=0x7dc020) at gsimpleasyncresult.c:789
#28 0x00007ffff67c348d in g_idle_dispatch (source=0x7fffe80046a0, callback=0x7ffff6da62a1 <complete_in_idle_cb>, user_data=0x7dc020) at gmain.c:5205
#29 0x00007ffff67c0a03 in g_main_dispatch (context=0x641950) at gmain.c:3054
#30 0x00007ffff67c18ac in g_main_context_dispatch (context=0x641950) at gmain.c:3630
#31 0x00007ffff67c1ad8 in g_main_context_iterate (context=0x641950, block=1, dispatch=1, self=0x675410) at gmain.c:3701
#32 0x00007ffff67c1f4a in g_main_loop_run (loop=0x71c700) at gmain.c:3895
#33 0x00007ffff726106d in gtk_main () at gtkmain.c:1156
#34 0x0000000000404ac6 in main (argc=1, argv=0x7fffffffdc38) at main.c:479
(gdb) cont
Continuing.

(gnome-settings-daemon:28897): GnomeDesktop-CRITICAL **: gnome_rr_output_info_get_geometry: assertion `GNOME_IS_RR_OUTPUT_INFO (self)' failed