[alsa-devel] Fix for Lenovo B50-70 inverted internal microphone bug

[Michał Wadowski]

Hi.
I prepared patch for this bug:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1524215

I tested this patch on Linux 5.1.0 and it fixes problem on my Lenovo 
B50-70 laptop.
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