DAC1 / DAC2 for ex137x - ES1370/1/2/3 , CT5880/CT4730(EV1938)

[Ariff Abdullah]

On Fri, 07 Oct 2005 08:32:53 +0800
David Xu <davidxu at freebsd.org> wrote:
> 
> I have applied the patch, it works. Can you tell me how to test
> the DAC function
By default, only DAC2. You need to set kernel hint hint.pcm.0.dac=0 (or
3, to swap the position) and reload the driver (or reboot, for
RELENG_5). From dmesg, you'll see something like this:

pcm0: <Creative SB AudioPCI CT4730/EV1938> port
0xe400-0xe41f,0xe800-0xe83f irq 18 at device 7.0 on pci0
pcm0: <SigmaTel STAC9704 AC97 Codec>
pcm0: <Playback: DAC1,DAC2 / Record: ADC>
                 ^^^^^^^^^

Now to ensure both are working, simply disable vchan:
sysctl hw.snd.maxautovchans=0
sysctl hw.snd.pcm0.vchans=0

.. and play any mp3/audio. Make sure you can run 2 sound apps
concurrently, which means the first one will use DAC1, and the second
the other. You may enable vchan back if you think you need more than 2
:)


> I feel the sound quality is a bit better than
> before when playing mp3.
> 
Which patchset did you applied? *_052.diff or *_052slave.diff ?


--

Ariff Abdullah
MyBSD

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