But I can't used it on Gentoo, I had installed the follow packages:
$ eix blue|grep "^\[I"
[I] net-wireless/bluez
[I] net-wireless/bluez-hcidump
[I] net-wireless/gnome-bluetooth
[I] x11-plugins/gkrellm-bluez
And with gnome-bluetooth, Apple bluetooth keyboard works well for
me. But when I connect to Logitech K810, it(maybe gnome-bluetooth)
always told me "Setting up 'Logitech K810' failed".