[alsa-devel] [PATCH] ALSA: usb - Don't create "Speaker" mixer controls on headphones and headsets

Raymond Yau superquad.vortex2 at gmail.com
Mon Nov 26 16:21:02 CET 2012

2012-11-23 下午8:49 於 "David Henningsson" <david.henningsson at canonical.com>
> A lot of headsets/headphones have a "Speaker" mixer control. This confuses
> PulseAudio to think it is a speaker instead of a headphone/headset.
> Therfore, we rename it to "Headphone".
> We determine if something is a headphone similar to how udev determines
> form factor (see 78-sound-card.rules).

does it really fix the problem since there are

1) usb headsets which has "PCM" volume control
2) some usb headphone support 5.1

does it mean that those non headset usb audio devices have a higher
priority than usb headset ?

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