Re: sound driver

[Jason Rennie <jrennie@csail.mit.edu>]

On Thu, Nov 18, 2004 at 11:51:22AM -0700, Justin Guerin wrote:
> Sounds like you have a DMA or IRQ problem.  Can you check which DMA and IRQ 
> channels are assigned during Knoppix boot, and during Debian boot?  You may 
> have to tell the sound module to use a specific IRQ when it's loaded.  I 
> had to do the same thing with my ISA card, when I first configured it.  I 
> just went down the list of available IRQs before I got to one that worked.

Did some reading on the subject.  The Sound How-To confirms your suspicisions:

  Another symptom is sound samples that loop. This is usually caused
  by an IRQ conflict.

The Boot Prompt How-To has information on boot arguments, but they
don't seem to work.  I tried both "sound=22" and "snd-via82xx=22"
(after making sure I had alsa-modules-2.4.27-1-686 installed), but the
card gets configured with IRQ 18.  Here's the dmesg output:

Via 686a/8233/8235 audio driver 1.9.1-ac3
via82cxxx: Six channel audio available
PCI: Setting latency timer of device 00:11.5 to 64
ac97_codec: AC97 Audio codec, id: VIA97 (Unknown)
via82cxxx: board #1 at 0xE000, IRQ 18

jrennie@desk:~$ cat /proc/cmdline 
root=/dev/hdb2 ro snd-via82xx=22

Any ideas what else I should try?

Many thanks,

Jason