I recently upgraded from FC4 to FC5, and everything went smoothly,
except now in alsamixer there are only two volume controls,
"headphones" and "pcm", whereas before there were several - pcm, front,
surround, headphones, etc. Currently, the control labeled "headphones"
behaves as a master volume control.

Also, before the upgrade I could plug headphones into the front
headphone jack and the external speakers would automatically be muted.
this is no longer the case.

the files

did not change during the upgrade. What could be causing this? Any
help appreciated.