What user settings control audio access?

Solution 1:

1) Would you please try this with user1:

sudo gpasswd -a user1 pulse-access
sudo gpasswd -a user1 pulse-rt
sudo gpasswd -a pulse audio

2) Have you tried this?

" edit /usr/local/etc/pulse/system.pa and add:

load-module module-native-protocol-unix auth-anonymous=1

Reference: https://tango.0pointer.de/pipermail/pulseaudio-discuss/2009-January/002942.html

3) Try running pulseaudio in system mode

Reference: https://bugzilla.redhat.com/attachment.cgi?id=262541

4) Make sure user2 does not run pulseaudio as root

5) Remove applications from user2 that may not release audio (e.g. timidity)

6) Go through ~/.asoundrc and /etc/asound.conf if present

7) Check if "the evil libflashsupport library" is installed. To uninstall:

 sudo aptitude purge libflashsupport flashplugin-nonfree-extrasound  

8) Start pulseaudio daemon system wide:

gksu gedit /etc/default/pulseaudio  

And change "PULSEAUDIO_SYSTEM_START=0" for "PULSEAUDIO_SYSTEM_START=1"

9) Try unplugging audio hardware like external speakers and reboot.