I have openSUSE 11.4 KDE version (64-bit) on a desktop PC. My sound card is ASUS Xonar DX 7.1 (PCI-E). I am brand-new to the Linux experience.
I get audio out to my speakers which are connected to the jacks of the rear I/O panel of my PC. I do not however get audio out to my headphones which are connected to the jack in the front panel. I know that the headphones work fine because they do so when I boot up in Windows XP.
Here is what I discovered so far: KMix does not show that I have a front panel audio channel. But when I run AlsaMixer it does show that I have such channel and, upon manually turning the volume on, I do have sound out to the headphones. Therefore, I deduct that I have some sort of configuration problem with KMix and would like to fix it as I prefer to use the GUI interface instead of the AlsaMixer one. It’s just a matter of preference!