On Thu, Nov 3, 2011 at 2:44 PM, Alan Mackenzie <a...@muc.de> wrote: > Hi, Alex > On Thu, Nov 03, 2011 at 07:16:53PM +0100, Alex Schuster wrote: >> The ONE in alsamixer? I have at least PCM, Front and CD, another PC >> also has Master. Are you missing some of those? Is a channel muted (you >> see 'MM' inmstead of a volume, use the M key to unmute)? Maybe you have >> to scroll with the right arrow key to see those channels? > > Ah, that was the problem. There are four effective volume controls in > alsamixer: master, PCM, front, and side. They seem to multply together > (each in the range 0 to 1). My "side" was only at ~30/100, the others > being around 80. > > Now they're all set to 93/100, and the volume control on the speakers > works sensibly. > > Why "side"?
Support for, e.g. 5.1 channel surround sound. > What is "PCM"? Pulse Code Modulation. A method of encoding audio data digitally. In ALSA, this usually refers to applications' feeding audio data in via purely-software means. (As opposed to via a sound card's onboard input) -- :wq
