Noticed one thing: It's the control of the volume buttons in front of my
Dell that's bugging out. When I started Alsa mixer and used the volume
buttons, I saw that the buttons only affected the master volume. The PCM
and the LFE isn't affected until master is at 0, then those two go to
zero if I press the button a few more times. If I use the lever for PCM
in the alsa mixer, I can adjust the playback volume just the way it
should work with the frontal buttons.

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Volume control only handle one of the sound channels
https://bugs.launchpad.net/bugs/447232
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