I've a 5.1 surround card (cmedia 8738) but i can't get output from the bass (subwoofer) speaker.

$ aplay -Drear logout.wav
Playing WAVE 'logout.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo


$ aplay -Dfront logout.wav
Playing WAVE 'logout.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo


$ aplay -Dcenter_lfe logout.wav
ALSA lib pcm.c:1787:(snd_pcm_open_conf) Invalid type for PCM center_lfe definition (id: center_lfe, value: cards.pcm.center_lfe)
aplay: main:484: audio open error: Invalid argument


only the center_lfe device is not working. Both center and rear can output sound very well.

Someone can point me out what i've been doing wrong?

Regards,
Leonardo Sá
mdk 9.2

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