I am also affected for device 413c:8156 (Dell Wireless 370 Bluetooth
Mini card) on Latitude E6400

For those looking for a quick fix: identify your bluetooth device ID
with "lsusb |grep luetooth" (e.g. 413c:8156 and 0a5c:4500 for me) and
then disable all matching entries in a line within this new file
/etc/udev/rules.d/81-bluetooth-hci.rules:

SUBSYSTEM=="usb", ATTRS{idVendor}=="413c", ATTRS{idProduct}=="8156", 
ATTR{authorized}="0"
SUBSYSTEM=="usb", ATTRS{idVendor}=="0a5c", ATTRS{idProduct}=="4500", 
ATTR{authorized}="0"

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https://bugs.launchpad.net/bugs/1767968

Title:
  systemd-udev cause high cpu load after upgrade to bionic

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