Bug#529697: linux-image-2.6.26-2-686: Crystal 4237b audio card not working and causing kernel freeze during boot
Thank you Stephen. Blacklisting both snd-cs4232 AND snd-wavefront is indeed key. I now have working sound using the original Lenny kernel :-)
Below are the contents of the file I created (/etc/modprobe.d/crystal_4237b_fix) to achieve this. I consider this an appropriate workaround for the bug; perhaps this means the severity should be lowered because of this?
==========================================================================
# <MANCONFIG>
# This file /etc/modprobe.d/crystal_4237b_fix, enables the Crystal 4237b
# sound chip to work correctly under Debian Lenny using the default
# 2.6.26 kernel on a Dell CPi D266XT laptop. (Not all of the soundcard's
# features have been tested, such as midi playback, but alsamixer and
# aplay /usr/share/sounds/alsa/Front_Left.wav work).
#
# It provides a workaround for bug Debian #529697, see:
# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=529697
#
blacklist snd_cs4232
blacklist snd_wavefront
alias char-major-116 snd
alias char-major-14 soundcore
alias snd-card-0 snd-cs4236
alias sound-slot-0 snd-card-0
#alias sound-slot-1 snd-card-1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss
options snd cards_limit=1
options snd-cs4236 index=0 id=CARD_0 port=0x530 cport=0x210 irq=5 dma1=1 dma2=0 enable=1 mpu_port=0x330 isapnp=0 fm_port=0x388 mpu_irq=7
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