http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=28&Level=5&Conn=4&ProdID=284
refer to alc892 datasheet
8.2.4 verb execute pin sense (verb id=709h)
payload
bit 0 right(ring) channel select
1: sense left channel(tip)
0: sense right channel(ring)
the ALC892 does not support hardware impedance sensing and will ignore this
control
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https://bugs.launchpad.net/bugs/874535
Title:
Volume Slider Jumps, due to rapidly changing hardware jack sense state
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