Bug#529697: linux-image-2.6.26-2-686: Crystal 4237b audio card not working and causing kernel freeze during boot

[STEPHEN POWELL <zlinuxman@wowway.com>]

I had a similar problem installing Lenny on an IBM ThinkPad 600 Model 2645-51U,
which also has a built-in Crystal Semiconductor CS4237B sound chip.  You
might want to check out my web site, http://www.wowway.com/~zlinuxman/tp600.htm,
to see how I handled the problem.  One thing in particular that I noticed
is that you blacklisted snd-cs4232, which is good, but you did not blacklist
snd-wavefront, which is bad.  You need to blacklist snd-wavefront too.  There
are many other sound tips in there too, including how to get the FM synthesizer
to work.  Hope this helps.