I noticed the following two lines.
[ 9442.157844] bluetooth hci0: firmware: brcm/BCM20702A0-0a5c-216f.hcd will not be loaded [ 9442.157846] Bluetooth: hci0: BCM: patch brcm/BCM20702A0-0a5c-216f.hcd not found
Did you try the firmware as https://wiki.archlinux.org/index.php/Dell_XPS_13_%282015%29#Bluetooth mentioned.
I noticed the following two lines.
[ 9442.157844] bluetooth hci0: firmware: brcm/BCM20702A0 -0a5c-216f. hcd will not be loaded -0a5c-216f. hcd not found
[ 9442.157846] Bluetooth: hci0: BCM: patch brcm/BCM20702A0
Did you try the firmware as https:/ /wiki.archlinux .org/index. php/Dell_ XPS_13_ %282015% 29#Bluetooth mentioned.