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73416ba
(Get the code!)
The acer timeline series, or at least some of the models, have this problem too (same intel sound hardware).
see bug https:/
In post #17 there's a workaround, it would be interesting to know if it helps people here too.
What it boils down to, is that the left channel of the microphone seems to be used to cancel out noises being transmitted through the chassis of the laptop. For example: disk and fan vibrations and typing or tapping noises. When the left and right microphone input are balanced not only undesirable noises get canceled out but your voice gets canceled out too.
The trick is to decrease the left channel a little compared to the right channel of the "capture" input in alsamixer. Use Q Z E and C to move only the right or left channel slider up or down.
This is not a fix, since "capture" also affects the external microphone (and probably other 'captures' though I didn't test that).
For more details see bug #459982 post #17