[linux-audio-user] volume plugin

[olig9 at gmx.de (Oliver Gerlich)]

Hello,

my onboard sound chip (CMedia 9739, on Epox 8RDA3+, with nforce2 
chipset) doesn't support volume changing in hardware (CMedia's cmaudio 
driver for OSS does all the volume calculation in software). That means 
that I'm unable to change the volume  with alsamixer or similar programs.

Now my question: is it possible to tell Alsa to change the volume in 
software? Is there a plugin that does this? I've already tried the 
"Route & Volume" plugin, but it doesn't do anything. XMMS plays sound 
still at full volume, and mplayer says "alsa-control: error setting left 
channel, Invalid argument" when changing volume.

My asound.conf entry for it looks like this:

pcm.nforcevol {
	type route

	slave {
		pcm "hw:0,0"
		channels 2
	}

	ttable.0.0 1;
	ttable.1.1 1;
}

Does anyone has an idea how to get volume control? Btw. I'm using the 
snd-intel8x0 driver for this chip.

Thanks in advance,
Oliver Gerlich