This is a pulseaudio bug, still present on 11.10
As a workaround edit /usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf :
gksu gedit analog-output-headphones.conf
Than search for and comment this line like here:
[Jack_InputDevice] #code = Headphone
This is a pulseaudio bug, still present on 11.10
As a workaround edit /usr/share/ pulseaudio/ alsa-mixer/ paths/analog- output- headphones. conf :
gksu gedit analog- output- headphones. conf
Than search for and comment this line like here:
[Jack_InputDevice]
#code = Headphone