There's a regression somewhere between bluez 5.69 bluez-libs 5.69 (working) and latest (currently 5.73) that breaks Bluetooth for device :
`Bus 001 Device 010: ID 0bda:b00a Realtek Semiconductor Corp. Realtek Bluetooth 4.2 Adapter`
bluetooth.service says condition unmet : /sys/class/bluetooth/ not found, checking it; `/sys/class/bluetooth/` exists but is empty when it's supposed to have a symlink from `/sys/class/bluetooth/hci0/` to `/sys/devices/pci0000:00/0000:00:08.1/0000:03:00.3/usb1/1-4/1-4:1.0/bluetooth/hci0/`
looking through the log there's also errors :
`usb 1-4: device descriptor read/64, error -71`
`usb 1-4: device not accepting address 6, error -71`
`usb 1-4: device not accepting address 7, error -71`
`usb usb1-port4: unable to enumerate USB device`
attachment is logs taken from the working version.