Re: [ALSA - driver 0000925]: no sound with CMI9761A, Cus fix verified OK

[Takashi Iwai <tiwai@suse.de>]

At Tue, 22 Feb 2005 21:26:14 +0100,
thomas schorpp wrote:
> 
> post it here, cant get on bugtracker:

Still not possible?

> this is ok with:
> 
> -pcm playback
> -pcm capture
> -looped through lines
> 
> thx, cus.
> 
>   Additional Information  	 After some testing i found that the 
> following patch fixes the problem:
> 
> --- ac97_patch.c.orig 2005-02-18 00:08:01.000000000 +0100
> +++ ac97_patch.c 2005-02-19 18:08:23.000000000 +0100
> @@ -2010,7 +2010,7 @@
>           ac97->ext_id |= AC97_EI_SPDIF;
>          /* to be sure: we overwrite the ext status bits */
>          snd_ac97_write_cache(ac97, AC97_EXTENDED_STATUS, 0x05c0);
> - snd_ac97_write_cache(ac97, AC97_CM9761_SPDIF_CTRL, 0x0209);
> + snd_ac97_write_cache(ac97, AC97_CM9761_SPDIF_CTRL, 0x0009);
>          ac97->rates[AC97_RATES_SPDIF] = SNDRV_PCM_RATE_48000; /* 48k 
> only */
> 
>          /* set-up multi channel */
> 
> 
> I don't know why it works, and what that 0x0200 bit means in that 
> register, someone may explain.

> 
> Cus
> 
> outstanding : Maybe better to use 0x0001 instead? I guess 0x0008 
> controls the "IEC958 Capture Monitor", and got some reports that this 
> disturbs the output. tashaki.
> 
> -no, now it disturbs no more.

Then let's take 0x09.


> all fine, thx.
> 
> add.:
> 
> with this you get master vol slider back:
> 
> 
> 	/* CM9761 has no Master and PCM volume although the register reacts */
> 	ac97->flags |= /*AC97_HAS_NO_MASTER_VOL |*/ AC97_HAS_NO_PCM_VOL;
> 
> @takashi: maybe this was tested only with pcm not with looped through 
> lines, before. i assume false negatives from previous tests.

OK, I'll fix the CVS now.


thanks,

Takashi


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