I had the same problem with Fedora 10. The headphones didn't work after an update I did yesterday (Jan 6, 2009). I have currently alsa driver version 1.0.8. They were shipped from the start with Fedora 10, so that it seems that the drivers were not the problem.
Then I tried to use the previous version of the kernel and now the headphones work again!!
The previous version that works OK is: 2.6.27.7-134.fc10.x86_64 The version that doesn't work is: 2.6.27.9-159.fc10.x86_64
This thread in the forum helped my A LOT.
Thanks,
Mario
------------------------- Mario Alberto Storti [cel. +54-342-156144983] CIMEC (INTEC/CONICET-UNL), Guemes 3450 - 3000 Santa Fe, Argentina Tel: +54-342-4511594 (ext 1015), Tel/Fax: +54-342-4511169 e-mail: mario.storti at gmail.com http://www.cimec.org.ar/mstorti [1] -------------------------
Links: ------ [1] http://www.cimec.org.ar/mstorti