I have already installed GNOME ALSA MIXER on Ubuntu. I did set all the parameters correctly. In Hardware settings, in the "choose a device to configure" section, it appeared as "Built in Audio - 1 Output / 1 input - Analog surround 5.1 output + analog stereo input" because I've selected that "Analog surround 5.1 output + analog stereo input" as the profile.
So the setting may be OK I think. But it only activates 3 channels in my audio system. Front Left, Right and the Sub woofer. Other channels don't work well. Here is the ALSA Mixer in terminal, I can"t volume up those channel from there.
Please give me simple and clear solution for to get this right. Guys please help me.