At Wed, 19 Feb 2003 16:59:07 -0500, Francois Ouellet wrote: > > Hi > > When I try to change the PCM volume using alsamixer, nothing happens. It > just plays at the same volume. Mute does work though. The Master volume > also does work as expected. Is this a limitation of some cheap on-board > chipsets, wrong driver loaded, missing feature to be added some time, > something else? it's likely because of AC97 codec, not the sound engine.
> "amixer info" says this for the SI7012 : > > Card default 'card0'/'SiS SI7012 at 0xdc00, irq 10' > Mixer name : '0x434d4941 CMI' > Components : 'AC97' > Controls : 29 > Simple ctrls : 18 i guess the driver on this machine is a bit old. > and this for the SI7018 > > Card default 'SI7018'/'SiS SI7018 PCI Audio at 0xc400, irq 11' > Mixer name : 'C-Media Electronics CMI9738' > Components : 'AC97a' > Controls : 161 > Simple ctrls : 147 the ac97 codec on both are same, CMI9738. hmm, strange, i don't found any description about this behavior in the datasheet... > Strangely (well, it does seem to have a different mixer...), another > machine with a SI7012 has a working PCM volume control. But this one > has to be talked to at 48 Khz, while the other work at 44.1 Khz also. > "amixer info" says this about the card : > > Card default 'card0'/'SiS SI7012 at 0xd800, irq 11' > Mixer name : 'SigmaTel STAC9721/23' > Components : 'AC97' > Controls : 30 > Simple ctrls : 20 because it has a different codec chip. perhaps this codec doesn't support variable bitrates. Takashi ------------------------------------------------------- This SF.net email is sponsored by: SlickEdit Inc. Develop an edge. The most comprehensive and flexible code editor you can use. Code faster. C/C++, C#, Java, HTML, XML, many more. FREE 30-Day Trial. www.slickedit.com/sourceforge _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
