the env ALSA_CARDS='eum10k1 etc...' mentioned in the newer 0.9.0 alsa-driver ebuilds has no effect for me: alsa-driver still compile the whole tens of drivers... or maybe I'm doing something wrong? It might happen, sadly... the exact commands I supplied (in bash, as root) are: env ALSA_CARDS='cmipci intel8x0' emerge alsa-drivers but configure still says I asked to build all modules.
These commands should go on one line; i.e. "emerge alsa-drivers" should be the arguments to the 'env' command.