[alsa-devel] No sound from speakers with Realtek ALC3226

[Takashi Iwai]

At Wed, 25 Feb 2015 13:25:35 +0400,
John Frankish wrote:
> 
> > > > > 
> > > > > I posted this on the alsa-user list, but did not get a reply.
> > > > > 
> > > > > Although it occasionally works, I am usually unable to get any 
> > > > > sound out of the speakers on a dell latitude e7240 using 
> > > > > alsa-1.0.28 and
> > > > > linux-3.16.6 - see details at the end of the post.
> > > >
> > > > If so, Windows or BIOS is the problem.  It doesn't set up the pin
> configuration properly Linux driver relies on.
> > > >
> > > I just updated the bios to the latest version, but no change :(
> > > >
> > > > If you get the status where the speaker works (e.g. after Windows
> clean
> > > reboot), try to take alsa-info.sh snapshot.  Run alsa-> info.sh with 
> > > --no-upload option, and save the generated output.  Then, take another 
> > > alsa-info.sh snapshot while the speaker > doesn't work.  Compare these 
> > > two outputs.  (At best, attach both (compressed) files.)
> > > >
> > > Alsa_info_works and alsa_info_no_works attached - diff didn't show an 
> > > obvious difference between getting sound from the speakers and not 
> > > getting sound from the speakers.
> >
> > OK, then this is not about the pin configuration, but likely the EAPD
> setup BIOS does.
> >
> > Did you try the newer kernels?  There has been a fix for EAPD control, and
> this might already fix your problem.
> 
> I'd rather patch my current kernel if possible - do you know where the EPAD
> control patch is by any chance?

Look through git log of sound/pci/hda/patch_realtek.c.  But beware
that the patches won't be applied cleanly; otherwise I would have
marked them for stable.

But I'll ask for testing with the newer kernels in anyway if patching
fails, so...


Takashi