My Kubuntu 14.04 also suffered from this problem. But the next seems to solve it:
in /etc/pulse/client.conf uncomment "Autospawn" line and change it to "Autospawn = no" and save
Then stop pulseaudio by the next command: killall pulseaudio
And restart kmix to switch it to new configuration.
My Kubuntu 14.04 also suffered from this problem. But the next seems to solve it:
in /etc/pulse/ client. conf
uncomment "Autospawn" line and change it to "Autospawn = no" and save
Then stop pulseaudio by the next command:
killall pulseaudio
And restart kmix to switch it to new configuration.