Although I select the emu1212 audio device flag, the appropiate firmware was not installed due to a bug in the ebuild (alsa-firmware-1.0.16): Relevant section of ebuild: local ea="no" for card in ${ECHOAUDIO_CARDS}; do use ${card} && ea="yes" && break done local emu="no" for card in ${EMU_CARDS}; do use ${card} && ea="yes" && break done [[ ${ea} == "no" ]] && rm -rf "${D}/lib/firmware/ea" [[ ${emu} == "no" ]] && rm -rf "${D}/lib/firmware/emu" In the emu loop, it should read instead: use ${card} && emu="yes" && break Reproducible: Always Steps to Reproduce: 1. Install alsa-firmware-1.0.16 with emu audio device flags
Indeed, some developer failed the copy/paste academy (that would be me). Sorry about that.