Re: ens1371/ac97 broken on my machine

[Takashi Iwai <tiwai@suse.de>]

At Wed, 21 May 2003 16:34:08 +1000,
Cameron Hutchison wrote:
> 
> The driver for the ens1371 chipset no longer works on my laptop.
> It used to work in version 0.9.0rc3, but in version 0.9.2 and 0.93a, it
> no longer works. When I try to run alsamixer, I get the error "No mixer
> elems found"
> 
> Details:
>   Distribution: Debian GNU/Linux (unstable)
>   Kernel: Linux 2.4.19, 2.4.20, 2.4.21rc2
>   Alsa kernel version: 0.9.2, 0.9.3a
>   lspci output (with and without -n):
>     00:09.0 Class 0401: 1102:8938
>     00:09.0 Multimedia audio controller: Creative Labs ES1371
> 
> I've tracked the issue back to the AC97 codec where it creates the mixer
> elements (in function snd_ac97_mixer(), file ac97_codec.c), in
> particular, this piece of code:
> 
>         /* test for AC'97 */
>         /* test if we can write to the record gain volume register */
>         snd_ac97_write_cache(ac97, AC97_REC_GAIN, 0x8a06);
>         if ((err = snd_ac97_read(ac97, AC97_REC_GAIN)) == 0x8a06) {
>                 ac97->scaps |= AC97_SCAP_AUDIO;
>                 ac97->caps = snd_ac97_read(ac97, AC97_RESET);
>                 ac97->ext_id = snd_ac97_read(ac97, AC97_EXTENDED_ID);
>                 if (ac97->ext_id == 0xffff)     /* invalid combination */
>                         ac97->ext_id = 0;
>         }
> 
> It seems that snd_ac97_read() does not read back the value 0x8a06 and
> never sets AC97_SCAP_AUDIO, which means the mixer elements never get 
> created.

i put a workaround code for ens1371 to avoid this.
can you try the cvs version?


thanks,

Takashi


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