Re: [Openvortex-dev] Low volume, distortion, etc

[O.Sezer]

Manuel Jander wrote:
> Hi,
>
> I have been playing with some AC97 registers, and it semes,
> that some of them made a difference. As i suspected, on the
> Aureal chip side everything semes OK, but the codec config isn't
> right.
>
> Most Vortex 2 cards (MX300) have the STAC9708/11 codec, which has
> a lot of extra "features". That includes a "Enable external AMplifier
> PIO bit". After enabling it explicitly, the aoutput semes a lot louder.
> Passing signal to a powererd down amplifier isnt a good idea anyway, and
> it wouldnt surprise me is that causes distortion.
> I'm not sure if these changes really are right. Its very late and im
> sleepy, but if i'm not on crack, it really semes very louder now to me.
> Thjis has to be changed inside of au88x0_mixer.c:
>
> int __devinit snd_vortex_mixer(vortex_t *vortex) {
>     ac97_t ac97;
>         int result;
>     memset(&ac97, 0, sizeof(ac97));
>     // Intialize AC97 codec stuff.
>     ac97.write = vortex_codec_write;
>     ac97.read = vortex_codec_read;
>     ac97.private_data = vortex;
>         
>         result = snd_ac97_mixer(vortex->card, &ac97, &vortex->codec);
>         if (vortex->codec) {
>                 /* Disable -6dB input and output attenuation.  */
>                 vortex_codec_write(vortex->codec, 0x6c, 0x0);
>                 /* Enable external amplifier. This is for STAC9708/11           
> codecs.
> STAC9701/03 don't need this but doesnt harm. */
>                 vortex_codec_write(vortex->codec, 0x26, 0x8000);
>         }
>     return result;
> }
>
>
> Best Regards,
>
> Manuel Jander.
>
>
>
>
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Hello:

Upon applying your latest change, the loudness is really
fine and I am quite happy with my MX300 + Alsa drivers.

Some glitches, though:  When _not_ using oss emulation,
the "fast play" and "clicks" problems are still there
For example, xmms+alsa plugin has this problem  but
xmms+oss or xmms+arts plugin not;  arts is configured
to autodetect.

Playing to external midi has serious problems: Doing a
"playmidi -e canyon.mid" ,  playing about 5-6 seconds
and then pressing ^C, the last note continues playing
eternally. Even upon halt, I see the shutting down alsa
message but it still keeps playing. Upon this failure,
I see in dmesg:

ALSA ../../alsa-kernel/drivers/mpu401/mpu401_uart.c:226:
        cmd: 0xff failed at 0xe0b4d800 (status = 0x80, data = 0xc9)

OTOH, I don't know if this is a general alsa problem or
a problem with aureal drivers.

Many thanks to all who keep working on these drivers;

O. Sezer