Okay guys I finally found out the solution on myself!
Realtek did destroy alsa indeed, but because ubuntu 11.10's alsa version was too new for Realtek 's driver!
So now I'm running Ubuntu 10.4 Lucid Lynx (which GUI I like much more than 11.10's Unity...).
I installed the driver after these instructions:
1) get this package
sudo apt-get install build-essential
2）Unpacking
tar xfvj LinuxPkg_5.16rc25.tar.bz2
cd realtek-linux-audiopack-5.16
tar xfvj alsa-driver-1.0.24-5.16rc25.tar.bz2
3）Compiling and installing
cd alsa-driver-1.0.24
sudo ./configure --with-cards=hda-intel
sudo make
sudo make install
4）Reboot
sudo reboot
After that I had to change the Hardware Profile to 5.1 Analog Output + Analog Stereo Input and then my Subwoofer finally worked!!!!!!
But then I created a playlist in VLC and after every track my Subwoofer didn't work again!!! Mysterious...
But I fixed that too ;)
I had to set in /etc/pulse/daemon.conf the line :
enable-lfe-remixing = no
to
enable-lfe-remixing = yes
Besides that I found out there seems to be a mistake in this file!!!! one line says:
; default-sample-channels
you got to remove the semicolon ( ; ) and enter your number of channels so that it looks like this (for my case a 5.1 system):
default-sample-channels=6
After all that trouble I can finally enjoy my 5.1 Sound system on Ubuntu (unfortunately not on the latest version but what should I do ;) )
I hope I can help someone with the same problem because it was hard work for me to find all that stuff out!
In the Terminal (Ctrl+Alt+T), run:
alsamixer
And increase the Master volume.
Best Answer
use alsamixer but first, install the extra driver support:
At this point, you may need to reboot.
Then, execute the following commands in an open terminal:
Then, press F6 use the arrow key to select your sound card and then press ENTER.
Next, press F5 and scroll to the right using the arrow keys until you get to Auto-Mute. Use the up arrow key to disable automute.
Finally, scroll to the subwoofer using the left or right arrow key and control the volume using the up and down arrow keys. Also, press the M key to mute or unmute each channel.