I've seen in Lucid that by default the front panel headphones do not work.
If you open gnome-alsamixer you can see a checkbox where you can check "Independent HP" that fix this problem in jaunty, but in Lucid this checkbox doesn't fix nothing.
POSIBLE workaround
If you open a terminal and type the command "alsamixer" (similar to gnome-alsamixer but only for terminal) then you can see a menu similar to gnome-alsamixer. You can see the same checkbox "Independent HP", but in this case it works fine and you can toggle on or off the front panel headphones.
I've seen in Lucid that by default the front panel headphones do not work.
If you open gnome-alsamixer you can see a checkbox where you can check "Independent HP" that fix this problem in jaunty, but in Lucid this checkbox doesn't fix nothing.
POSIBLE workaround
If you open a terminal and type the command "alsamixer" (similar to gnome-alsamixer but only for terminal) then you can see a menu similar to gnome-alsamixer. You can see the same checkbox "Independent HP", but in this case it works fine and you can toggle on or off the front panel headphones.