Using the stock pacman.conf, community is set before alarm and I'm always asked if I want to replace libcec-rpi with community/libcec. I always answer 'no', but I what I would like to know:
a) is community supposed to take precedence over alarm on an rpi-b, and;
2) does it matter which version of libcec I have installed? I assume that I want libcec-rpi because it's on an rpi, but then;
*) see 'a'