diff --git a/resources/default_tweaks.py b/resources/default_tweaks.py
index c4c951f980..091aa9a34d 100644
--- a/resources/default_tweaks.py
+++ b/resources/default_tweaks.py
@@ -48,7 +48,7 @@ authors_completer_append_separator = False
 # When this tweak is changed, the author_sort values stored with each author
 # must be recomputed by right-clicking on an author in the left-hand tags pane,
 # selecting 'manage authors', and pressing 'Recalculate all author sort values'.
-author_sort_copy_method = 'invert'
+author_sort_copy_method = 'comma'
 
 #: Use author sort in Tag Browser
 # Set which author field to display in the tags pane (the list of authors,
diff --git a/src/calibre/gui2/device.py b/src/calibre/gui2/device.py
index fdba83beba..ed036415ac 100644
--- a/src/calibre/gui2/device.py
+++ b/src/calibre/gui2/device.py
@@ -615,6 +615,7 @@ class DeviceMixin(object): # {{{
     #: management might have kicked off a sync_booklists to write new metadata onto
     #: the device, and that job might still be running when the signal is emitted.
     device_metadata_available = pyqtSignal()
+    device_connection_changed = pyqtSignal(object)
 
     def __init__(self):
         self.device_error_dialog = error_dialog(self, _('Error'),
@@ -762,6 +763,7 @@ class DeviceMixin(object): # {{{
             self.location_manager.update_devices()
             self.library_view.set_device_connected(self.device_connected)
             self.refresh_ondevice()
+        self.device_connection_changed.emit(connected)
 
     def info_read(self, job):
         '''