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argh sorry, just have seen that you already tried the alsa-base-trick ...

What's the hardware you've got built in?

You can find out with

aplay -l

I added a

options snd-hda-intel model=IEC958

yeah, that's just this mixer application.

what you could try is to activate all tracks and see if you find then an "External Amplifier" checkbox in the Switches tab.

Got a solution for my problem ... Would bet that this also fits for your VAIO:

- Enter gnome volume control panel (alsa mixer)
- Enter the "Edit / Settings..." or similar menu (got the German...

So for my VGN-T2XP/S ... Same problem ...