At Mon, 9 Oct 2006 09:45:39 -0400, Daniel Jacobowitz wrote: > > On Mon, Oct 09, 2006 at 03:37:49PM +0200, Takashi Iwai wrote: > > At Sun, 8 Oct 2006 18:27:26 -0400, > > Daniel Jacobowitz wrote: > > > > > > How is volume control supposed to work for surround sound codecs? Is there > > > typically a register which affects every channel, or do you have to adjust > > > them separately? I've been staring at the datasheets and prodding the > > > registers for mine (ICE1724, on a Shuttle SN25P). There's three pieces: > > > the vt1720, the vt1617a, and a wm8728. The vt1617a has ac97 volume control > > > registers, but the "master" volume doesn't affect the center/lfe or rear > > > surround channels. I am guessing that the wm8728 is just for the last two > > > channels (I've got jacks for 7.1 but the vt1617a only does 5.1). > > > > That's the standard behavior of AC97 codec. The "master" doesn't > > influence on surrounds. Some ac97 codec chips have an extended mode > > that behaves differently, though. > > I assume this one doesn't. But could you tell me one supported card > which does, so that I can compare? Thanks. AFAIK, AD198x codecs have an non-compatible mode. It's controlled via register 0x76 bit 14. > > alsactl save & restore should work for softvol. > > The softvol mixer element doesn't exist only at the very fresh state. > > I see, I just tried it and alsactl will create a user control just > fine. That's great. > > I will give the softvol solution a try, and post the patches if it > works. That's nice. Thanks. Takashi ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
