I have only some problems with the speakers not the headphones. It's not the first time.
I had no sound problem with Pardus 2009. But when they released Pardus 2009.1 I get a weak sound.
Was possible to fix that and change the main sound channel from "Front" to "Master Front" from the Kmix but take some time to find that out.
No issues with Pardus 2009.2.
Pardus 2011 was okay to, but now when they released 2011.1 I seem to have the same problem as in Pardus 2009.1 again.
One example. When I listen to some music in the living room I twist the sound volume button at the speaker to 20 % from maximum in Ubuntu 11.04 (Gnome) and thats a nice sound volume when I sit and listen.
When I replaced Ubuntu with Pardus 2011.1 I must twist the sound volume button to 50 % from maximum to get equal sound volume from the speakers compared with Ubuntu. For me that's a indication that the sound settings are not optimal after a clean install.
And the Kmix settings are different in this version to. I not understand why the KDE developers must change everything from version to version in Kmix?
I only find one pre-installed option here and no "front", "master front" or any other option:http://bugs.pardus.org.tr/attachment.cgi?id=7393
Before it look something like this:http://docs.kde.org/stable/en/kdemultimedia/kmix/Settings.html#Master_Channels
By the way I have tested the new version of PCLinuxOS (KDE) 2011.6 and I have the same sound problem as in the new Pardus to.
The speakers are not completly mute but much lower volume compared to Ubuntu.