Hi Yoshihiro,
>Can you try the following command with root privileges?
>
># mixerctl outputs.master.mute=on
># mixerctl outputs.master.mute=off
>
The commands run successfully but do not mute audio. This may be
because I'm listening from headphones and I have disabled laptop speaker
output through mixerctl outputs.master.slaves.
>If this does not change the mute, the problem may not be with
>sndioctl, but with the sound driver or audio codec hardware.
Interesting point. Relevant dmesg output:
azalia0 at pci0 dev 27 function 0 "Intel 82801I HD Audio" rev 0x03: msi
azalia0: codecs: Conexant CX20561
audio0 at azalia0
I'll continue to experiment and give an update if I find a solution.
Thanks,
James
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