Nearly identical to bug 14927. Xfdesktop crashes sometimes when I power *on* the monitor. 14927 seems to have been fixed and I haven't had this problem for a while. But, since a recent distribution upgrade, I have noticed this problem a few times. Neither power-manager nor xscreensaver has been able to control the monitor sleep in many years, and I haven't tried it recently, but that is why I have to turn on and off the monitor. AMDGPU.
Stack trace of thread 249601:
#0 0x00007f7a4303a110 g_type_check_instance_is_a (libgobject-2.0.so.0)
#1 0x00005625e1e7511a xfce_backdrop_loader_closed_cb (xfdesktop)
#2 0x00007f7a43015742 g_closure_invoke (libgobject-2.0.so.0)
#3 0x00007f7a43029604 signal_emit_unlocked_R (libgobject-2.0.so.0)
#4 0x00007f7a430323ae g_signal_emit_valist (libgobject-2.0.so.0)
#5 0x00007f7a430329d3 g_signal_emit (libgobject-2.0.so.0)
#6 0x00007f7a4324b283 gdk_pixbuf_loader_close (libgdk_pixbuf-2.0.so.0)
#7 0x00007f7a4311019a g_task_return_now (libgio-2.0.so.0)
#8 0x00007f7a431101dd complete_in_idle_cb (libgio-2.0.so.0)
#9 0x00007f7a42f27dcb g_idle_dispatch (libglib-2.0.so.0)
#10 0x00007f7a42f2b4a0 g_main_context_dispatch (libglib-2.0.so.0)
#11 0x00007f7a42f2b830 g_main_context_iterate.isra.0 (libglib-2.0.so.0)
#12 0x00007f7a42f2bb23 g_main_loop_run (libglib-2.0.so.0)
#13 0x00007f7a4372b42d gtk_main (libgtk-3.so.0)
#14 0x00005625e1e7d08c xfdesktop_application_start (xfdesktop)
#15 0x00005625e1e7d2ac cb_wait_for_window_manager_destroyed (xfdesktop)
#16 0x00007f7a42f27e23 g_source_callback_unref (libglib-2.0.so.0)
#17 0x00007f7a42f295fc g_source_destroy_internal (libglib-2.0.so.0)
#18 0x00007f7a42f2b548 g_main_context_dispatch (libglib-2.0.so.0)
#19 0x00007f7a42f2b830 g_main_context_iterate.isra.0 (libglib-2.0.so.0)
#20 0x00007f7a42f2b8d3 g_main_context_iteration (libglib-2.0.so.0)
#21 0x00007f7a4313dc75 g_application_run (libgio-2.0.so.0)
#22 0x00005625e1e6c3ef main (xfdesktop)
Ubuntu report with verbose stack trace:
*** Bug 16639 has been marked as a duplicate of this bug. ***
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