[alsa-devel] Onkyo SE-200PCI : What can the first pair of RCA output do?
tiwai at suse.de
Thu Feb 5 10:14:49 CET 2009
At Tue, 3 Feb 2009 04:22:45 +0000 (GMT),
> I am running on Fedora 9 / Alsa 1.0.18a. I have tried
> to play 24bits 6ch PCM file on Onkyo SE-200PCI and the
> 6ch output from VGA-like connector are very good.
> Thanks for the good work!
> I would like to know what is the intention for the
> first pair of RCA output? Apparently, I am able to get
> the first two channels out of the 6 channels audio
> file when I play through plug:surround51, but the
> remaining four channels were not able to get heard.
> Could alsamixer or any asound.rc options can make
> Onkyo SE-200PCI to produce a downmix of 6ch on the
> first pair of RCA output? Can this be done through the
> hardware chips themselves, or any asound.rc options
> can make this work?
> Or could it be, the first pair of RCA output is really
> hardwired, like ice1712/se.c has suggested because of
> WM8740 chip, to always give an exact copy of the first
> 2 channels out of the 6 channels playback?
It's rather a restriction of envy24-HT (ice1724). The controller chip
has no mix support.
You can downmix, however, easily via alsa-lib plugin by adjusting the
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