[pulseaudio-discuss] [PATCH] switch-on-port-available: check and change default sink or source

[Tanu Kaskinen]

On Fri, 2017-04-28 at 12:21 +0800, Hui Wang wrote:
> Hello Tanu,
> 
> Could you please take a look at this patch, you are the maintainer and 
> recently contributed couple of commits to 
> module-switch-on-port-available.c. :-)

Well, I'm trying to concentrate on preparing for the release, so I
don't do patch reviews much at the moment. Now that I read the commit
message, I have some comments, though.

> On 04/27/2017 11:20 AM, Hui Wang wrote:
> > Suppose your machine has two sound cards as below:
> > 
> > Card#0(HDA INTEL HDMI)-> Sink#0(hdmi-stereo)->hdmi-output(priority: 5900)
> > Card#1(HDA INTEL PCH)->Sink#1(analog-stereo)->headphones(priority: 9000)
> > 
> > If neither hdmi cable nor headphone plug into the machine, the default
> > sink will randomly be Sink#0 or Sink#1, let us assume it is Sink#1,
> > then users plug hdmi cable into the machine, the port hdmi-output will
> > change to the state PA_AVAILABLE_YES, so the Sink#0 has a port with
> > state YES, while the Sink#1 still has a port with state NO, in this
> > situation it is reasonable to change the default_sink to Sink#0, but
> > current code can't do that.

This problem should be fixed by these two patches:
https://patchwork.freedesktop.org/patch/139179/
https://patchwork.freedesktop.org/patch/139178/

The patches have been reviewed, but I haven't yet pushed them. I'm not
sure if they'll be in the next release or not (I need to ask Georg and
Arun if they want to grant a freeze exception for these patches).

> > Let us suppose another situation, both hdmi cable and headphone are
> > plugged into the machine, and the Sink#0 is the default sink, if users
> > unplug the hdmi cable, the port hdmi-output is changed to NO while
> > the port headphone is still kept YES, in this situation it is
> > reasonable to switch the default_sink to Sink#1, but current code
> > can't do that.

This should be fixed too by those two patches mentioned above.

-- 
Tanu

https://www.patreon.com/tanuk