About 14 months ago I purchased a nice new ~$300 set of altec lansing 5.1 speakers, which include a USB-sound card. Since that time they've largely gone unused, or at least not properly used. I brought this up on the mailing list at the time, but didn't get much response, so I thought I'd poke my head up again and see if anybody has any insight.
First off, the set works correctly, out-of-the-box under windows, without having to install any special drivers or software at all.
Under linux, plugging them in instantly freezes the usb sound card up, and locks it at 100% volume, in such a way that there's absolutely no way to turn the volume down: not from alsamixer, and not from the speaker's hardware control dial. Sound does play, but again, it's unbearably loud, to the point where I don't do it for risk of damaging my speakers and/or ears.
I filed the bug away on the bug-tracker, but haven't heard much out of it since. The bug contains my lsusb -v information, the "contents" output from amixer for this card, and some preliminary results showing some ability to tweak the volume with amixer, but not reliably.
Any suggestions are welcome. I'm happy to experiment with this set more if it can help, run experimental code, etc. Heck, I'd go at the thing with a screwdriver for chipset information if I know what I was looking for or thought it could help.