[alsa-devel] [PATCH] Sigmatel stac92hd71b7 low HP volume
tiwai at suse.de
Tue Oct 7 07:44:44 CEST 2008
At Mon, 6 Oct 2008 19:10:14 +0200,
Klaas De Craemer wrote:
> On Mon, Oct 6, 2008 at 12:57 PM, Takashi Iwai <tiwai at suse.de> wrote:
> > [please don't drop Cc to alsa-devel ML]
> > At Mon, 6 Oct 2008 12:48:43 +0200,
> > Klaas De Craemer wrote:
> >> Hello,
> >> I'm sure that the audioquality will degrade somewhat because of the additional amplification,
> >> but before, the HP-out was not usable at all. I had to use an external ampli just to use my
> >> headphones, even after turning all volume sliders to 100%. Then again, when removing the HP,
> >> the volume though the internal speakers was way too loud...
> >> I'm not sure what you mean with the output pin and headphone control, but I have uploaded the
> >> output of the codegraph tool before and after my modification here:
> >> http://users.vtk.be/~s0159120/codec_original.svg
> >> http://users.vtk.be/~s0159120/codec_final.svg
> >> Below is the output of alsa-info with the patched module
> >> Klaas
> > Thanks.
> > So, if I understand correctly, when the pin 0x0a is connected directly
> > from DAC0 0x10, the output level is too low even if you set the all
> > volumes maximal.
> That is correct.
> > In the alsa-info.sh output, I see the following:
> >> Node 0x10 [Audio Output] wcaps 0xd0c05: Stereo Amp-Out R/L
> >> Amp-Out caps: N/A
> >> Amp-Out vals: [0x5e 0x5e]
> > which means that you decrease the output level intentionally.
> > Is the HP output still too low even if you set to the higher value?
> No, after the patch I don't need 100% anymore.
Of course not :)
> The HP output is fine
> now, and I can tune it up and down a bit. Before using the mixer-amp,
> going from 90 to 100 resulted in going from no sound to little sound.
> Now the range is more useful.
Could you check the raw value of the widget 0x10 without your patch?
The percent doesn't tell you exactly what you changed.
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