The problem with the HDaudio device is it is very generic.
The device vender and device ID indicate that is is a realtek hd audio chip. It would appear you have generic drivers installed.
The latest drivers can be found from the realtek site(select the proper version of Windows. It should be one of the top 2 files) or alienwares homepage(you would have to put in your model number that should be on the case).
http://www.realtek.com/DOWNLOADS/do...=24&Level=4&Conn=3&DownTypeID=3&GetDown=false
If all installs as it should you should see the following.
In my case it is
2 for my capture card
2 from my video card(one out and 1 for shadowplay screen capture).
1 is the one you are looking for realtek HD audio.
With that all setup you should now have a program that allows you to tell the card to keep playing audio even when the headphone jack is jammed up with another plug(more or less).
Now your rear and front will show up as 2 cards, this means you will have to tell Windows to use the rear as the default output.
Hit start and type Sound(this should make windows search). select the sound program with the speaker icon.
You will now see all your playback devices.
Make your speakers the default output if it is currently the 2nd output.
You may need to restart your audio programs for the changes to take effect.
You have an alternative and VERY fast way if your setup supports jack-retasking.
If you you have this feature you should see a front green as plugged in. double click it and bring up the re-tasking menu.
Select front speakers instead of headphones.
With any luck audio will instantly start playing from your rear speaker jack(it did when I tried it).
You last option is to open the system and disconnect the front put audio cable(it is a 10 pin connector from the front to the back, but you have to watch it, usb looks the same, but has difference cable colors. Most boards list HD audio so it is easy to find.). It is easy to do and should do the trick as well.