bbswitch 0.5 has been released and fix this bug https://github.com/Bumblebee-Project/bbswitch/issues/35
+*bbswitch-0.5 (27 Oct 2012) + + 27 Oct 2012; Pacho Ramos <pacho@gentoo.org> +bbswitch-0.5.ebuild: + Version bump fixing kernel-3.6 regression, bug #439384 by Michele Ciacci. +