X301 audio
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I have a Lenovo X301 laptop with FreeBSD on it.
To get the speakers to stop playing, and the headphones to start playing, when I plug the headphones in, I have the following bit in /boot/device.hints</boot>:
hint.hdac.0.cad0.nid22.config="as=1 seq=15 device=Headphones"
hint.hdac.0.cad0.nid26.config="as=1 seq=0 device=Speaker"
hint.hdac.0.cad0.nid24.config="as=2 seq=15"
hint.hdac.0.cad0.nid29.config="as=2 seq=0"