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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