This seems to be a FAQ item.
See http://lalists.stanford.edu/lau/2010/09/0116.html
Summary: I believe pulseaudio should work by default with ice1712
cards and recent versions of ALSA if you ensure your ALSA definitions
(perhaps from an old ~/.asoundrc containing bad !default definitions
found on the net) aren't interfering with built-in support for this
soundcard.
In order for things to work /usr/share/alsa/alsa.conf has to load, as does
/usr/share/alsa/cards/ICE1712.conf and the definitions setup can't be
interfered-with or bad things will happen across the board, including
a nonfunctioning pulseaudio -- which expects all these default names
defined for all cards.... With these setup (as happens by default in
recent ALSA versions) correctly -- have pulseaudio talk to the
/usr/share/alsa/cards/ICE1712.conf defined "default" or "iec958"
pseudo-devices.
If "aplay -L" doesn't list the full expected set, then somethings
wrong. For a Delta66, for example you see:
default:CARD=M66
M Audio Delta 66, ICE1712 multi
Default Audio Device
front:CARD=M66,DEV=0
M Audio Delta 66, ICE1712 multi
Front speakers
surround40:CARD=M66,DEV=0
M Audio Delta 66, ICE1712 multi
4.0 Surround output to Front and Rear speakers
surround41:CARD=M66,DEV=0
M Audio Delta 66, ICE1712 multi
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=M66,DEV=0
M Audio Delta 66, ICE1712 multi
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=M66,DEV=0
M Audio Delta 66, ICE1712 multi
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
iec958:CARD=M66,DEV=0
M Audio Delta 66, ICE1712 multi
IEC958 (S/PDIF) Digital Audio Output
http://lalists.stanford.edu/lau/2010/09/0116.html goes into detail on the
"default" and "iec958" devices defined in
/usr/share/alsa/cards/ICE1712.conf . These ensure correct
bit-alignment and channel mapping from a world that normally talks to
16 bit soundcards with fewer than 8 channels. The envy24 uses oddball
S32_LE alignment as it's designed for 24 bit use and efficient PCI
transfers of that data; adding to the confusion, it presetns a card
with 10 output channels and 12 capture channels. That is what tends to
send misconfigured systems and pulseaudio into failure.
Niels
http://nielsmayer.com
PS: this is all in theory, since I have deinstalled pulseaudio on my
system. However, I've experienced similar issues in configuring an
ICE1712-based card for "consumer" usage -- e.g. using a Terratec
DMX6Fire's breakout box headphone/mic connections for google talk
voice (works beautifully -- use the digital mixer to pipe-in your own
"on hold" music.).
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Received on Sat Oct 2 00:15:01 2010
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