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Fixing Bluetooth Accessory Connectivity

Configuration changes to Bluez main.conf to resolve keyboard and mouse sleep disconnects.

#BLUETOOTH#HARDWARE
If your Bluetooth works great on almost everything except keyboards and mice, then your controller mode configuration may be the issue.
Lenovo Yoga Mouse with dual-mode switch for Bluetooth and 2.4 GHz wireless connection
Lenovo Yoga Mouse with dual-mode Bluetooth connectivity
Edit /etc/bluetooth/main.conf and find ControllerMode:
sudo nano /etc/bluetooth/main.conf
# Restricts all controllers to the specified transport. Default value # is "dual", i.e. both BR/EDR and LE enabled (when supported by the HW). # Possible values: "dual", "bredr", "le" ControllerMode = dual
Restart the Bluetooth daemon to apply the change:
sudo systemctl restart bluetooth
Your Bluetooth mice and keyboards will now connect reliably.