APPLIED(B, C): [SRU][B/C/D/unstable][PATCH 0/1] fix the pop noise for lenovo laptops with alc285

[Khaled Elmously]

On 2018-11-27 10:42:02 , Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1805079
> 
> [Impact]
> Lenovo told us that some linux uers reported headphone noise on Lenovo's
> website. After investigating, we found those Lenovo laptop mdoels all
> have the codec of alc285, and we can reproduce the noise problem too.
> 
> [Fix]
> Don't use the DAC of headphone, let headphone share the DAC with speaker,
> the noise disappears.
> 
> [Test Case]
> After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1
> Yoda2, no noise anymore
> 
> [Regression Potential]
> Low. This patch only apply to several lenovo machines, and after applying
> this patch, both speaker and headphone still work very well.
> 
> 
> Hui Wang (1):
>   ALSA: hda/realtek - fix the pop noise on headphone for lenovo laptops
> 
>  sound/pci/hda/patch_realtek.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> -- 
> 2.17.1
> 
> 
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