[Bug 219350] [snd_hda] ALC256: no sound out off headphones jack

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219350

--- Comment #19 from Masachika ISHIZUKA <ish at amail.plala.or.jp> ---
(In reply to Ivan from comment #18)
I don't know what is doing with ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE.
I found the below when searching with
'ALC256_FIXUP_DELL_XPS_13_HEADPHONE_NOISE'.

| On Tue, 24 Nov 2015 04:08:18 +0100,
| Hui Wang wrote:
| > 
| > We have a machine Dell XPS 13 with the codec alc256, after resume back
| > from S3, the headphone has noise when play sound.
| > 
| > Through comparing with the coeff vaule before and after S3, we found
| > restoring a coeff register will help remove noise.

So, I think that patch is for resume.

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