profiles:
output:analog-stereo: Estéreo analógico Salida (priority 6000)
output:analog-stereo+input:analog-stereo: Estéreo Analógico
Dúplex (priority 6060)
output:analog-stereo+input:iec958-stereo: Estéreo analógico
Salida + Estéreo Digital (IEC958) Entrada (priority 6055)
output:analog-surround-40: Analógico envolvente 4.0 Salida
(priority 700)
output:analog-surround-40+input:analog-stereo: Analógico
envolvente 4.0 Salida + Estéreo analógico Entrada (priority 760)
output:analog-surround-40+input:iec958-stereo: Analógico
envolvente 4.0 Salida + Estéreo Digital (IEC958) Entrada (priority 755)
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=blob;f=sound/pci/hda/hda_codec.c;h=2da78751951305957bc5e3f761248ab1906abf87;hb=0b1714ad362cab7895cd711bd996818f4191ccf2
refer to snd_hda_multi_out_analog_prepare()
if the model allow 4 channels , the internal speaker and subwoofer are
in surround instead of mout->extra_out_nid
a set of surround 4.0 speaker ( front and rear) instead of two pairs of
stereo speakers
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https://bugs.launchpad.net/bugs/1070543
Title:
[MacBook4,1, Realtek ALC889A, Speaker, Internal] Only right bass
speaker is working, left is not.
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