Alrighty, so I had bought a Toshiba laptop a few months back and was dissapointed when I plugged in my earphones and sound came from both the earphones and the regular speakers.
I was using Feisty with Kubuntu. I knew it wasn't the jack as it worked under Windows just fine!
Since the 8.04 Beta upgrade, using Gnome I might add, it works without a hitch. Haven't tried with KDE just yet, but I am extremely happy as this was a near deal breaker for me and I almost returned the laptop!
I'm wondering if this has to do with Pulse Audio?
Thought I'd share the good news. Now if only I can get Compiz Fusion running on it's ATI card...