For the record, the module was included starting in 6.6.9-1: $ grep -i CS35L41 /boot/config-6.6.9-amd64 CONFIG_SND_HDA_SCODEC_CS35L41=m CONFIG_SND_HDA_SCODEC_CS35L41_I2C=m CONFIG_SND_HDA_SCODEC_CS35L41_SPI=m CONFIG_SND_SOC_CS35L41_LIB=m CONFIG_SND_SOC_CS35L41=m CONFIG_SND_SOC_CS35L41_SPI=m CONFIG_SND_SOC_CS35L41_I2C=m