gradedcheese

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RedHat Linux 9 does not see this card by default but there is a kernel module in 2.4 kernels and probably some earlier ones that supports it. I found a site with info on making the card work under earlier RedHat distros but this should work for just about anyone...

(in /etc/modules.conf)

alias sound-slot-0 cs4232
post-install sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -L >/dev/null 2>&1 || :
pre-remove sound-slot-0 /bin/aumix-minimal -f /etc/.aumixrc -S >/dev/null 2>&1 || :
options sound dmabuf=1
alias synth0 opl3
options opl3 io=0x388
options cs4232 io=0x530 irq=5 dma=1 dma2=0 mpuio=0x330 mpuirq=9


The purpose of this is to tell it to use cs4232 for the card and then there are some additional lines to make the card not do weird stuff on startup (it will make random sounds). Some people reported that the card does weird things on sleep because it doesn't save it's registers but i haven't had any problems yet.

hw-tph

The sound chip in the Thinkpad 600E is a 4237B and not the 4610/11 as lspci reports. The 4610/11 are PCI chips while the 4237B (also found in a lot of other laptops like the Dell Latitude CPi series) are ISA chips.

As gradedcheese notes this card works with the OSS drivers, but the Alsa drivers work even better. The snd-cs4232 driver works but is unstable on the 600E and you should rely on the snd-cs4236 driver instead. Both late 2.4 series with external Alsa and 2.6 series kernels with kernel-supplied Alsa (or external) works well. Add the following to /etc/modules.conf:

options snd device_mode=0666
alias snd-card-0 snd-cs4236
alias sound-slot-0 snd-cs4236
options snd-cs4236 port=0x530 cport=0x538 isapnp=0 dma1=1 dma2=0 irq=5
# OSS support
alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss

...and that should pretty much be it. Either modprobe the module or use the alsasound script in /etc/init.d, unmute the proper channels and you're on your way to a better living with Alsa.