On Sun, 01 Nov 2015 20:53:14 +0100,
Ondrej Zary wrote:
>
> ESS Allegro (marked ES1989S), [125d:1988] (rev 10) is mute after
> loading snd-maestro3 and running alsactl restore. Touching master
> volume or mute makes it work.
>
> Looks like a bug in the AC'97 codec integrated into the chip.
>
> Write AC97_MASTER register twice to work-around the problem.
>
> Signed-off-by: Ondrej Zary <[email protected]>
Applied, thanks.
Takashi
> ---
> sound/pci/maestro3.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
> index 965d5c6..17ae926 100644
> --- a/sound/pci/maestro3.c
> +++ b/sound/pci/maestro3.c
> @@ -1929,6 +1929,16 @@ snd_m3_ac97_write(struct snd_ac97 *ac97, unsigned
> short reg, unsigned short val)
> return;
> snd_m3_outw(chip, val, CODEC_DATA);
> snd_m3_outb(chip, reg & 0x7f, CODEC_COMMAND);
> + /*
> + * Workaround for buggy ES1988 integrated AC'97 codec. It remains silent
> + * until the MASTER volume or mute is touched (alsactl restore does not
> + * work).
> + */
> + if (ac97->id == 0x45838308 && reg == AC97_MASTER) {
> + snd_m3_ac97_wait(chip);
> + snd_m3_outw(chip, val, CODEC_DATA);
> + snd_m3_outb(chip, reg & 0x7f, CODEC_COMMAND);
> + }
> }
>
>
> --
> Ondrej Zary
>
> .
>
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