5.1-channel sound on 8-STABLE, snd_hda

Mikle Krutov nekoexmachina at gmail.com
Sat Jan 23 22:48:10 UTC 2010

So, i've already configured it for playing real 5.1 sound with real
5.1 sound files, but i've got no duplication of sound with stereo
files - but i want it (they've sounded better with my rear &
sub-speakers, even through they are not 5.1). Could i somehow set it,
not globally, but only for some applications? What man page i should
refer to?

2010/1/24, Alexander Motin <mav at freebsd.org>:
> Hi.
> Mikle Krutov wrote:
>> I've got MSI mb 760GTM-P33 with ATI hd audio chip (pciconf shows '
>> device     = 'IXP SB600 High Definition Audio Controller'').
>> 5.1 sound worked on 8.0-RELEASE (sound was on every channel, but i
>> could not change vol per-channel, only globally), and after updating
>> to -STABLE - i've got only 2 channels working.
>> Any ideas about that?
> Previously you had 2 channels of stereo playback duplicated to every
> channel pair of your 5.1 system. Now real multichannel support added to
> snd_hda, so all excessive duplication was removed.
> Now you should just configure vchans for your speakers setup by setting
> dev.pcm.X.play.vchanformat sysctls and you will get _real_ multichannel
> sound.
> --
> Alexander Motin

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