On Sat, May 03, 2014 at 11:00:33AM -0700, Bill Unruh wrote: > That does not mean that the switchoff of the internal speaker when the > headphones are plugged in is not hardware. Some systems have, in the physical > headphone plugin, a little switch which opens when the headphones are plugged > in and which stops the current flowing to the internal speaker. Some hae a > software switch which senses when current is flowing to the headphones, and > sends back a signal to the sound card which then in software stops the > headphones. The latter could in principle be controlled by alsa, the former > could not. Such harware switches are common on amplifiers as well-- the > assumption being > tht if you are listening to headphones, you clearly do not want to also be > listening to speakers as well. This also allow the volume knob to control > both, since if both were on, when the speakers were at a comfortable level, > the headphones could well be too loud. Sorry, not that technical aware about hardware. The fact is that with factory Ubuntu, speakers muted automatically when headphones were plugged in. -- Αντώνης Κουζούπης Antonis Kouzoupis
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