[alsa-devel] CS4232 Playback bug on Tecra 500

[Takashi Iwai]

At Thu, 22 Jan 2009 17:28:56 +0100,
Krzysztof Helt 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).

Isn't there any way to check this conflict between CS4232 and CS4236?
If we can know that the particular card is for snd-cs4232, snd-cs4236
could give a warning and quit...


Takashi