Asus P4P800 VM ... connet to audio front panel problem

I want to connect the front audio panel from my case to the
motherboard. I followed the instruction from manual and connected the
audio cable from the front panel to the motherboard. Then, the front
panel audio output is working but the rear audio output is not
working. I don't know why.

Can anyone tell me how to make both front and rear audio output
working at the same time?

 

If your case has an "Intel compatible" front panel audio, then there
are two contacts on the headphone jack on the front of the case, that
make continuity so the audio can be routed to the back of the case,
whenever the headphone isn't plugged in.

If you have a vanilla headphone jack, it is missing the two contacts,
so it breaks the connection to the back of the case.

Notice how there are two jumpers on the FPAUDIO header when no case
audio cable is connected? These jumpers are performing the function
of routing audio to the back of the case. When you remove the jumpers
and plug in the case audio cable, it is the responsibility of the
case to make the connection that the two jumpers used to make.

To see what the proper jack would look like, see this drawing:
http://rocky.digikey.com/WebLib/CUI Inc/Web data/SJ-3515.pdf

This jack has tip (T), ring, (R), and sleeve (S). It also has two
terminals labelled 3 and 4, and these are the contacts that return
audio to the back of the computer. When a headphone is plugged into
the jack, contact 3 and 4 open, so sound on the back of the case is
muted. When the headphone is removed, 3 and 4 make contact, and route
the audio to the back of the case. Since your case headphone jack is
missing contact 3 and 4, the sound on the back of your computer cannot
work while the case audio cable is plugged in.

Many cases are not compatible with the Intel style header, and this
is one of the results. My advice is to remove the cable and put the
two jumpers back. Either that, or find a case that has a proper cable
assembly. There aren't too many cases that do this function well.

If you want to reward Asus for creating this problem for you, you
could buy a "J-Panel", as seen on this page. I believe it has the
Intel audio cable on it - that is what the advert suggests. The
J-Panel is not the same as the infamous I-Panel status display.

http://www.asus.com/products/mb/mb_accessories.htm (see J-Panel)

HTH,
Paul