From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: Re: "PM / QoS: Fix device resume latency PM QoS"
	breaks sound
Date: Tue, 31 Oct 2017 00:36:59 +0100
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To: Chris Clayton <chris2553@googlemail.com>
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On 10/28/2017 10:10 PM, Chris Clayton wrote:
> Hi,
>
> I pulled the latestchanges from Linus' tree this evening and have found that with the new kernel, sound is not working
> on my laptop. More precisely, the built-in speakers don't produce any sound. Sound does work when I use ear-plugs in the
> headphone socket. It also works via a bluetooth speaker.

This patch should fix it: https://patchwork.kernel.org/patch/10032147/

Thanks,
Rafael