[pulseaudio-discuss] [PATCH] alsa: don't assume that hw:x is an analog output

Tanu Kaskinen tanuk at iki.fi
Thu Apr 27 19:08:19 UTC 2017

On Wed, 2017-04-26 at 14:19 +0530, Arun Raghavan wrote:
> On Mon, 24 Apr 2017, at 08:36 PM, Tanu Kaskinen wrote:
> > Previously, if front:x didn't work, we would try to use hw:x for analog
> > stereo output. There's no guarantee that hw:x is an analog output,
> > however. For example, the Intel HDMI LPE driver uses hw:x for HDMI
> > output, and PulseAudio incorrectly created analog profiles for that
> > card, because front:x doesn't work but hw:x does.
> > 
> > This patch changes things so that the analog stereo mapping doesn't any
> > more use hw:x as a fallback. A separate "unknown stereo" fallback
> > mapping is added to handle the rare case where hw:x is the only PCM
> > device that works.
> > 
> > BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=100488
> > ---
> I recall that front: actually adds a softvol on top of hw: (in some
> cases?), and we actually wanted to move to hw: always.

Using hw: always seems like a bad idea (for the reasons described in
this patch).

> Do we know if that's still true?

At least I don't know.



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