Nigel and anyone interested in alsa and USB development,
nh> ... both snd-intel8x0, and snd-hda-intel are
being loaded, and it seems like they are both trying to grab card0, which is
resulting in neither getting card0, and snd-usb-audio is getting card0,
because the other 2 are having a non resolvable argument as to who gets
card0.
There are two sound devices. Intel 82801BA/BAM
AC'97 on the system board and C-media USB plugged in.
>From my previous investigation.
dalton:~# cat /proc/asound/cards
0 [default ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:1f.2-2, full
speed
If the C-Media is card 0, then the Intel device
should be card 1. The Intel drivers should not
involve a USB device ... unless it contains
an Intel or Intel-like chip.
nh> Try adding the 3 lines below to the bottom of
the alsa-base file.
There is a simple test before editing alsa-base.
Unplug the C-Media device before starting the
system and plug it after the on-board Intel chip
is initialized. This is from my first trial.
dalton:~# cat /proc/asound/cards
0 [I82801BAICH2 ]: ICH - Intel 82801BA-ICH2
Intel 82801BA-ICH2 with AD1885 at irq 17
1 [default ]: USB-Audio - C-Media USB Headphone Set
C-Media USB Headphone Set at usb-0000:00:1f.2-2, full
speed
Which seems consistent with my hypothesis.
Further hypothesizing: the Intel 82801 invokes
snd_intel8x0 while the C-Media USB invokes snd_hda_intel.
I'll try this unplug/replug procedure a few more times
and report next week.
USB and udev are appealing concepts but implementation
is certainly non-trivial.
Thanks for the help. Progress would be difficult
without it.
Regards, ... Peter E.
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