[alsa-devel] CS4232 Playback bug on Tecra 500

Stanley Pinchak stanley.pinchak at gmail.com
Thu Jan 22 20:03:32 CET 2009

     Thank you for the pointers.  I have since upgraded to 2.6.28 and
followed your blacklist suggestions.  I will report back if the bug
reappears.  Perhaps if the bug is indeed squashed, the wiki entry on
the Tecra can be updated with these suggestions.

Stanley Pinchak

On Thu, Jan 22, 2009 at 11:28 AM, Krzysztof Helt <krzysztof.h1 at poczta.fm> wrote:
> Hi Stanley,
> In short words, you need to upgrade the kernel. Also,
> blacklist or delete the snd-cs4236.ko module.
> A longer description. The ALSA page about Tecra
> laptop you mentioned is wrong. Your CS4232 card
> is a PNP BIOS device and does not need any
> parameters. However, your kernel is dated 20080623
> and there was a fix for a cs4232 driver crash commited
> on 20080727 to the kernel. The crash is visible in
> your dmesg file:
> [   91.243845] BUG: unable to handle kernel NULL pointer dereference at 00000158
> [   91.244314] IP: [<c02088ad>] pnp_activate_dev+0x3/0x3a
> [   91.244714] *pde = 00000000
> [   91.244977] Oops: 0000 [#1]
> Next thing is that your have a second driver loaded:
> the snd-cs4236. Do not load this driver. AFAIR, the
> snd-cs4236 driver should be blacklisted or removed
> on laptop with the cs4232 chip and PNP BIOS. The
> cs4236 and cs4232 have the same PNP BIOS id-s.
> The snd-cs4236 was incorrectly loaded instead of
> the snd-cs4232 at least on my laptop (old Dell).
> I hope this helps you,
> Krzysztof
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