On Tue, 3 Dec 2002, James Stafford wrote:
> Attached are two patches that add basic Envy24HT support to the ICE1712
> driver and VT1616 to the AC97 codec driver. They were made against the cvs
> from today.
>
> Issues:
> Quote from VT1616 data sheet: "The VT1616 powers up with pins 39 and 41
> assigned to the Front channel DACs as described in the 2.2 specification.
> When this bit is to �0�, the output pins get assigned to the Rear stereo
> DAC pair with an independent volume control."
> The reference design uses pins 39 and 41 for the left and right rear
> outputs. I have added a control to set this bit to 0 but the default is 1.
> Should a patch function be used to set the default to 0?
I think that the default should be left in the AC97 code and write the
appropriate configuration after snd_ac97_mixer() call when you detect your
hardware and VT1616 codec.
> When using applications such as MPlayer and ac3dec, the centre/lfe and rear
> outputs are swapped so that the data for the rear comes out of centre/lfe
> and vice versa. Is there something I have missed here?
We send data in this order: channel0,1 = front; channel2,3 = rear;
channel4,5 = center/lfe ; if your hardware has swapped some stereo paths,
you need to swap channels in software - see
alsa-lib/src/conf/cards/ICH.conf - ICH.pcm.surround51.0 {} section
I've applied your patch and fixed one missing update in ice1712.h. Also,
the driver id is changed in CVS.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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