HOWTO: Logitech MX1000 Bluetooth USB Mouse
From Sabayon Wiki
If you own a Logitech MX1000 mouse, you might find after a fresh install or an update that it no longer works.
Don't worry, your mouse isn't broken, the connection between the mouse and its USB receiver is still functional, but for some reason udev doesn't pick up on it anymore.
This is easily solved by editing one config file. In fact, only one word in that file needs to be edited and the sleepy rodent will wake up again.
/usr/lib64/udev/rules.d/97-bluetooth-hid2hci.rules
KERNEL=="hiddev*"
KERNEL=="hidraw*"
Save the file and reboot.