the driver should select the path without boost (stepsize=0x27) when the
pin is line in

it is a side effect of the driver to create "Line Boost Volume" control


Node 0x0c [Audio Selector] wcaps 0x30010d: Stereo Amp-Out
  Control: name="Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-Out vals:  [0x00 0x00]
  Connection: 2
     0x08 0x09*
Node 0x0d [Audio Selector] wcaps 0x300101: Stereo
  Connection: 2
     0x09* 0x08

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https://bugs.launchpad.net/bugs/1257973

Title:
  [Dell OptiPlex 745,AD1983]Regression:  Input from Line-in / Mic can't
  be listened in the output anymore

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