Suppress warnings while Playing or Recording Audio with ALSA

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Mar 4, 2018, 7:37:21 PM3/4/18

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While recording audio with arecord or playing audio with aplay you will see some WARNING messages;

ALSA lib pcm_dmix.c:1018:(snd_pcm_dmix_open) unable to open slave

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem

ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline

To supress them comment out few lines in /usr/share/alsa/alsa.conf as follows:

# PCM interface

# redirect to load-on-demand extended pcm definitions

pcm.cards cards.pcm

pcm.default cards.pcm.default

pcm.sysdefault cards.pcm.default

pcm.front cards.pcm.default

# pcm.rear cards.pcm.rear

# pcm.center_lfe cards.pcm.center_lfe

# pcm.side cards.pcm.side

pcm.surround40 cards.pcm.surround40

pcm.surround41 cards.pcm.surround41

pcm.surround50 cards.pcm.surround50

pcm.surround51 cards.pcm.surround51

pcm.surround71 cards.pcm.surround71

pcm.iec958 cards.pcm.iec958

pcm.spdif iec958

pcm.dmix cards.pcm.dmix

pcm.dsnoop cards.pcm.dsnoop

# pcm.hdmi cards.pcm.hdmi

# pcm.modem cards.pcm.modem

# pcm.phoneline cards.pcm.phoneline

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