I use Skype with out .asoundrc or other configuration of dmix!
try skype with out .asoundrc!
In that case, it doesn't work! What is your /etc/asound.conf ?
Do you have set ALSA in the audio option ini skype?
# more /etc/asound.conf
#Generated by system-config-soundcard, do not edit by hand #SWCONF #DEV 0 defaults.pcm.card 0 defaults.pcm.device 0 defaults.ctl.card 0