IDE devices cause system freeze when /dev/dsp is used on PWS 600au

[Alexander Kotelnikov <sacha@debian.org>]

Hello.

I got the following trouble: after I have replaced stock Toshiba CD
reader with Nec DVD writer (ND-3520A) system become totally frozen if
something tries to use /dev/dsp. I have switched DMA everywhere, I
could (IDE disk and cd, soundcard), but this did not help. One thing I
noticed is that problem is gone if I detach any of IDE disk or cd.

Does anyone know, what happens?

Thanks,
-- 
Alexander Kotelnikov
Saint-Petersburg, Russia