[SOLVED] Re: HDA RealTek ALC256 : problems with headphones output

Marcel Bonnet marcelbonnet at gmail.com
Fri Mar 8 12:27:28 UTC 2019

On Thu, 7 Mar 2019 at 16:36, Marcel Bonnet <marcelbonnet at gmail.com> wrote:

> Hi. I need help with a HDA device: RealTek ALC256 (laptop is Dell Latitude
> 3490).
> I can hear from speakers. But the problem is the headphone output.
> If I plug the headphone, as a long as I increase the volume and mixer pcm
> to above 50 I heard the presence of "some" audio. But the sound is heard at
> very low level.
> If I disconnect the plug, slowly, without removing, then I hear the music
> playing louder, but as I increase volume, the music sounds as if I was
> tunning a FM receiver on the road and miles away from the radio station:
> you hear music, but you hear noise (that static).
> So I was looking into hda sources, forums, linux sources... and I got no
> clue.  I experimented lots of sysctl and hints ... nothing worked.
> I also noticed that was necessary to add this hint:
> dev.hdaa.1.config=senseinv , because the logic of plug detection is
> inverted.
> If you look at the attachments, you'll find that there are some notices: "
> hdacc1: Unexpected unsolicited response with tag 63: ffffffff "
> I'm really lost. I appreciate help.
> --
> Marcel Bonnet
I found this old proposed patch in bugzilla:

It works. It came from Linux patches tree for their HDA driver.

Marcel Bonnet

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