This problem still exists. I think it's due to #1 some notebooks having an 
inverted mic channel and #2 Pulseaudio auto/dynamic-setting mic levels of both 
channels equal.  So when you turn down one channel to allow it to work 
(workaround) Pulseaudio sets it back which disables the mic again.   I don't 
know if this problem should be resolved in the Kernel or Pulseaudio. But I have 
seen an "inverted mic" is a common problem that many people have and struggle 
with getting their mic to work as a result. 
I have the Lenovo G50-45 with updated BIOS: 
A2CN45WW(V2.13)
Running the latest Manjaro distro w/kernel 4.14:
Linux G50 4.14.55-1-MANJARO
08/04/2016

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https://bugs.launchpad.net/bugs/1619866

Title:
  Lenovo G50-45 inverted microphone not detected properly

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