Comment 2 for bug 1152313

StacktraceTop:
 _gdk_device_translate_axis (device=device@entry=0x0, index_=index_@entry=0, value=0, axis_value=axis_value@entry=0x0) at /build/buildd/gtk+3.0-3.6.0/./gdk/gdkdevice.c:1595
 translate_axes (device=0x0, x=-21, y=0, window=0x21485a0, valuators=valuators@entry=0x23b9490) at /build/buildd/gtk+3.0-3.6.0/./gdk/x11/gdkdevicemanager-xi2.c:894
 gdk_x11_device_manager_xi2_translate_event (xevent=<optimized out>, event=<optimized out>, display=<optimized out>, translator=<optimized out>) at /build/buildd/gtk+3.0-3.6.0/./gdk/x11/gdkdevicemanager-xi2.c:1379
 gdk_x11_device_manager_xi2_translate_event (translator=<optimized out>, display=<optimized out>, event=<optimized out>, xevent=<optimized out>) at /build/buildd/gtk+3.0-3.6.0/./gdk/x11/gdkdevicemanager-xi2.c:1101
 _gdk_x11_event_translator_translate (translator=translator@entry=0x2121320, display=0x213c020, xevent=xevent@entry=0x7fff09c83df0) at /build/buildd/gtk+3.0-3.6.0/./gdk/x11/gdkeventtranslator.c:51