Hi, On Tue, Apr 12, 2011 at 12:15 PM, duportail <poort at telenet.be> wrote: > Try to test the new xubuntu 11.04 with kde on a multi-user system. > The first user (for example user1) can log in and gets a default sink from > pulse. > The second user(for example user2) that will log in gets a auto_null because > pulse did not found any sinks. > If i log out user1, than user2 can get a default sink by kill and start > pulse. > Where should be the reason? This is the "classic" multi-user problem: you're using a soundcard without hardware mixing, so only one ALSA application can take direct control of the hardware device at a time. user1's pulseaudio daemon takes control of it, so obviously user2's PA daemon will just get "Device or resource busy" when trying to snd_pcm_open() on hw:0 (for example). This problem has existed since ALSA existed. There's no direct fix without scrapping the API and rewriting it. I guess there is no solution yet (still) in 11.04, but you can see that folks in the Ubuntu community are trying to resolve the issue with a number of possible approaches: https://wiki.edubuntu.org/BluePrints/multiuser-soundcards-pulseaudio Running as system-wide is one possible approach... http://www.pulseaudio.org/wiki/SystemWideInstance Not sure if there's yet a solution allowing the use of shm and module-native-protocol-unix for multiple users (this is ideally what you'd want for maximum performance / minimum latency), but it's quite easy to set up module-native-protocol-tcp and connect to localhost using the `default-server' parameter in client.conf, at the cost of latency. Let me know if you need more details on this particular approach. BTW, search the archives of this list at gmane < http://blog.gmane.org/gmane.comp.audio.pulseaudio.general > -- there are many many historical posts about multi-user setups. Sean > > gd > > _______________________________________________ > pulseaudio-discuss mailing list > pulseaudio-discuss at mail.0pointer.de > https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss >
