I just installed KDE, ALSA
When I log in as a regular user in kde I get the message:
Sound server informational message:
Error while initializing the sound driver:
device: default can't be opened for playback (No such device)
The sound server will continue, using the null output device.
and the audio is not working.
This does not happen when I log in as root. As root everything is fine and the sound is working.
What is the problem?
put your user in the audio Group
gpasswd -a $user audio
and in next time read the wiki
Have you tried to turn it off and on again?