[Fwd: Re: newer C-Media CMI9761A, your testpatches], unrequested headphone-out, equalizer set

[thomas schorpp <t.schorpp@gmx.de>]

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hello,

tonight i discovered one more issue:

sound output quality of the looped through lines conn. to external
hifi-amplifier:

- - low+high band drain > 6dB or mid-band gain > 6dB

possible causes:

- - driver sets headphone output instead of external ampflifier mode
(poss. wrong output impedance effecting fr-linearity)

tried switching in mixer, result negative.

- - the build-in equalizer is set implicitely online by the driver.

y
tom
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[-- Attachment #2: Re: [Alsa-devel]   C-Media CMI9761 -A- type, your patches --]
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From: thomas schorpp <t.schorpp@gmx.de>
To: Takashi Iwai <tiwai@suse.de>
Subject: Re: [Alsa-devel]   C-Media CMI9761 -A- type, your patches
Date: Fri, 18 Feb 2005 04:59:49 +0100
Message-ID: <42156835.9010202@gmx.de>


> But, before changing this, please check whether my last patch works.
> If this is OK, I can fix the above together.

 > both patches applied to rev 1.73 patch.c et al.

bad idea ;) your patch code isnt even run there.

next time state the rev to patch, pls. but for future i assume head.

updated to head.

applied both patches...

verifying.....

- low unregulateable noisy distorted output of pcm sound after muting 
"iec capture monitor"

- no vol master slider
- no pcm master slider
- 1 dxs slider

hope this helps, meanwhile i read the mixer building functions and 
rollback to 1.73 and try a override to get the missing sliders back.

seems to be not underestimateable diffrence with my chips registers.

tom