[pulseaudio-discuss] Routing of audio to loudspeakers or headphones

[pl bossart]

> Even when this is all done, you will still not get everything working
> 100% perfectly just yet. Jack sensing is (apparently - not looked for a
> while) a mess and does not work reliably on all drivers. We need to fix
> that and probably will enable automatic port switching on jack status in
> due course. But until this comes in, when you plug in your headphones,
> you have to manually change the port in pavucontrol (labelled connector
> in gnome tools).

For jack sensing, we'd need a module that traps input events. ALSA
sends an input event when the headphone jack is inserted. This is
what's used in Meego (the detection isn't part of PulseAudio though).
You could then add enable the effect.
-Pierre