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0e1f616
(Get the code!)
Also affecting me.
I don't know if others are seeing slightly different symptoms, or have misinterpreted. For me, the problem is simply:
* surround and LFE seem to be equivalent, at least in that they both adjust up the sub-woofer volume.
* the LFE and Surround volume levels are maximised by default
* If I set these to lower levels in alsamixer, then everything sounds great. However, adjusting the volume control in gnome's panel immediately ramps these right up to 100% again, as if someone made the assumption that you'd always want pumping basslines, even if you turn the overall volume down.
Setting a sane surround and LFE volume by default, saving volume levels across reboots, and setting surround and LFE to volume = ignore in the aforementioned config file is all I really need to fix this. Slightly better would be for the gnome volume to move LFE and surround proportionally to the main volume. Ideal would be for ALSA to present these levels relative to the main volume, rather than as absolute values.
Also, some have suggested that gnome's volume control should adjust the PCM volume. I think that would be broken. My expectation of the gnome volume control, when only one slider is presented, is that it adjusts the master volume, and (although it fails in this), there would be an "advanced" option where individual sliders/
Note that I'm running an Asus P7P55D-E LX mobo, with a Logitech 5.1 surround speaker system, though I haven't bothered connecting the surround speakers.