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Ubuntu 15.10 (wily) reached end-of-life on July 28, 2016.
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We appreciate that this bug may be old and you might not be interested
in discussing it any more. But
it is a bug of alsa driver which allow you to add four speakers when
your alc668 are 6 channel codecs
Default sink name: alsa_output.pci-_00_1b.0.analog-surround-71
Default source name: alsa_input.pci-_00_1b.0.analog-stereo
sys/class/sound/hwC1D0/init_pin_configs:
0x12 0x90a60130
0x14
snd_hda_intel :00:03.0: bound :00:02.0 (ops
i915_audio_component_bind_ops [i915])
[1.600370] snd_hda_codec_realtek hdaudioC1D0: autoconfig for ALC668:
line_outs=5 (0x14/0x18/0x19/0x1a/0x16) type:speaker
[1.600373] snd_hda_codec_realtek hdaudioC1D0:speaker_outs=0
https://bugzilla.kernel.org/show_bug.cgi?id=65091
do you mean quad speaker array use four channels instead of two
** Bug watch added: Linux Kernel Bug Tracker #65091
http://bugzilla.kernel.org/show_bug.cgi?id=65091
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