If you’re having issues getting your Bluetooth device to automatically reconnect between KDE sessions (or rebooting your computer), try opening a terminal (e.g. Konsole) and clear the contents of your /var/lib/bluetooth directory. After doing this you will need to restart the bluetooth daemon. For reference, in a Gentoo/Funtoo system, the following will accomplish this:
rm -rf /var/lib/bluetooth/* /etc/init.d/bluetooth restart
Note that the above needs to be run as root (or use sudo). After removing the contents of your /var/lib/bluetooth directory, you will need re-pair your device in the Bluetooth manager. When paring your device, make sure it is set a trusted device.
Now, KDE should automatically reconnect the Bluetooth device after rebooting your computer. Note that the device may not reconnect until after you have logged in. To reconnect sooner, try using a command line Bluetooth device manager.
-John Havlik
[end of transmission, stay tuned]