[alsa-devel] HD-audio regression after commit 34588709af61be1550b4e2bcee5c85d0ac4f34d4

[Raymond Yau]

> >
> > > > >> >> >> >> >> >Yes, testing the latest code with real machines is
> > highly
> > > > >> >> >> >> >> >appreciated.  Try sound-unstable git tree, either
> > master or
> > > > >> >> >> >> >> >test/hda-migrate branch.
> > > > >> >> >> >> >> >  git://
> > > > >> >> >> >
> > git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-unstable.git
> > > > >> >> >> >> >> >
> > > > >> >> >> >> >> >Alternatively you can build the external alsa-driver
> > modules from
> > > > >> >> >> >> >> >alsa-driver-unstable snapshot tarball, too
> > > > >> >> >> >> >> >
> > > > >> >> >> >> >
> > > > >> >> >> >
> >
ftp://ftp.suse.com/pub/people/tiwai/snapshot/alsa-driver-unstable-snapshot.tar.gz
> > > > >> >> >> >> >> >
> > > > >> >> >> >> >> >Note that only the behavior of model=auto has been
> > changed in the tree
> > > > >> >> >> >> >> >above.  The other model behaviors of AD codecs are
> > unchanged at all.
> >
> > > > >> >> >> >
> > > > >> >> >> >Seen many ad1988 controls are missing ?
> > > > >> >> >> >
> > > > >> >> >> >1) rear Mic, line , front Mic  playback volume and switch
> > > > >> >> >> >2) CD playback switch
> > > > >> >> >> >3) input mix in input source
> > > > >> >> >> >4) analog loopback mix volume and mute switch
> >
> > > > But the number of controls is smaller than in linux stable 3.7.2. I
> > > > don't know if that's a regression.
> > >
> > >
> > > Unless you see *functional* degradation, it's no regression but
> > > regarded rather as a cleanup
> >
> > Refer to commit
> >
> >
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound-unstable.git;a=commitdiff;h=f3fc0b0b1fe31e0ec9a72ab85b421e74c696f00d;hp=3a65bcdc577a338712c2eaefc194909de79d4982
> >
> > The Stereo Mix of those VIA codecs allow ADD capture  DAC signal
> >
> > ad1988 and those realtek codecs can select input source from the audio
> > mixer which can mix the input pins
> >
> > - snd_hda_add_imux_item(imux, "Mix", 9, NULL);
> >
> > Those  static models (3stack , 3stack-dig, 6stack and 6stack-dig )still
> > have the input source "mix"
> >
> > static const struct hda_input_mux ad1988_6stack_capture_source = {
> >         .num_items = 5,
> >        .items = {
> >                { "Front Mic", 0x1 },   /* port-B */
> >                 { "Line", 0x2 },        /* port-C */
> >                 { "Mic", 0x4 },         /* port-E */
> >                 { "CD", 0x5 },
> >                  { "Mix", 0x9 },
> >        },
> > };
>
> This can be added now by passing a hint "add_stereo_mix_input=true".
> Maybe it's better to enable it unconditionally for AD1988, as this
> codec is mostly used for desktops, not for laptops.  (On laptops with
> auto-mic switching, the driver doesn't want to have capture sources
> other than mics.)

When there is no DAC connected to aa-mix , it is just "Input Mix" instead
of "Stereo Mix"

Those "Stereo Mix" of conexant codecs used in notebook are disabled