OK, thanks to diwic, there is a known workaround.

1. Install the "Pulseaudio Volume Control" application from Software Center
2. Open "Pulseaudio Volume Control" from the Dash
3. In the Input Devices tab, select "Analogue Input" in "Port:"
4. Deselect the padlock so that the channels are not linked together
5. Drag the Front Right channel all the way to the left: 0% (-∞dB)
6. Set Front Left to whatever mic volume you choose (e.g., 100%)

Skype and Mumble should now work fine. The microphone volume control
which appears in the Sound Menu will also now work to control your mic
volume in Skype/Mumble (it controls only the Front Left volume when
Front Right is 0%).

This doesn't fix the bug, per se, but it does let affected technical
people fix it for themselves.

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https://bugs.launchpad.net/bugs/903853

Title:
  [1080, Conexant CX20590, Mic, Internal] Background noise or low volume

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