[alsa-devel] No speaker output with kernel 3.15 and later

I sent Takashi an email mentioning this regression a month ago, and it's taken me this long to send this email... :-$

Since updating to kernel versions >=3.15 I've had no audio from my laptop speakers. Earlier versions worked fine.

It's a CLEVO W270EUQ laptop. The output mixer device is showing up, but no sound comes out at any volume level.

As requested I've attached compressed alsa-info.sh output for both the working and non-working cases.

I'm perfectly willing to test patches etc.