There also seems to be issues with tvtime, udev, and /dev nodes for sound, at least according to user(s) here:
http://forums.gentoo.org/viewtopic-p-7275100.html?sid=25b9d0f56a586743677d4f3ad7b1ebb9That particular issue seems to be tvtime specific, so if this gets unmasked, ensure sound doesn't have issues with it before doing so
Thanks, Samuli