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In my fresh Ubuntu 18.04 desktop I can't control sub woofer volume! I have connected a 5.1 Sony muteki speaker system through my GeForce 660TI HDMI out and works great, but sub woofer volume is too loud, and if I try to control it through system volume control slider, it does nothing!

Standard Ubuntu 18.04 sub woofer volume control does nothing

As you can see in the screenshot, there's one sub woofer slider, but moving that does not change sub woofer volume in the speaker system.

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