Yehaaa! I finally have sound on my Fedora FC3 linux box. It was always working in Mandriva 2005 LE but after upgrading the kernel to 2.6.11-1.27_FC3smp, I had no sound.
Anyway, muting Headphone Jack Sense & Line Jack Sense via 'alsamixer' resolved the issue. Below is my e-mail to firstname.lastname@example.org:
I checked my settings again for these two you mentioned and as I wrote
above they were already off but I did not hear anything. Still, I kept
on trying to mute/unmute others and got noise at some point. Then, I
muted all and started to unmute them one by one. After a little bit
more trial-and-error, suddenly it worked! Interestingly, it turned out
that I really just needed to have that two Muted! Why it did not work
before is beyond me.