[pulseaudio-discuss] [PATCH] alsa-mixer: make the mono mapping a fallback only

[Tanu Kaskinen]

On Thu, 2018-06-07 at 17:17 +0200, Georg Chini wrote:
> On 01.06.2018 10:24, Tanu Kaskinen wrote:
> > If a sound card doesn't have the "front" device defined for it, we have
> > to use the "hw" device for stereo. Not so long ago, the analog-stereo
> > mapping had "hw:%f" in its device-strings and everything worked great,
> > except that it caused trouble with the Intel HDMI LPE driver that uses
> > the first "hw" device for HDMI, and we were incorrectly detecting it as
> > an analog device. That problem was fixed in commit ea3ebd09, which
> > removed "hw:%f" from analog-stereo and added a new stereo fallback
> > mapping for "hw".
> > 
> > Now the problem is that if a sound card doesn't have the "front" device
> > defined for it, and it supports both mono and stereo, only the mono
> > mapping is used, because the stereo mapping is only a fallback. This
> > patch makes the mono mapping a fallback too, so the mono mapping is used
> > only if there's absolutely nothing else that works.
> > 
> > This can cause trouble at least in theory. Maybe someone actually wants
> > to use mono output on a card that supports both mono and stereo. But
> > that seems quite unlikely.
> > ---
> >   src/modules/alsa/alsa-mixer.c                  |  1 +
> >   .../alsa/mixer/profile-sets/default.conf       | 18 ++++++++++--------
> >   2 files changed, 11 insertions(+), 8 deletions(-)
> > 
> 
> Looks good to me. I don't mind having it in 12.0, but let Arun have
> the last word.
> 
> BTW, when are we going to release 12.0? I have not heard any
> complaints yet.

Next week seems possible. Hopefully Arun can comment on this patch.

-- 
Tanu

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