>
>David Xu wrote:
>|
>| I tried to backout ac97.c revision 1.43, now my sound card works again,
>| If someone wants more information, please tell me.
>
>David
>
>Could you revert to head and check that the mixer "ogain" is non-zero
>(say 100 :-)? On some codecs "ogain" provides the traditional
>functionality of "vol". I appreciate this is not ideal.
>
>Thanks
>- Orion
I found that reading AC97_MIX_AUXOUT register in ac97_fix_auxout()
has side effect on my sound card, although it has 0x8000 bit set,
it might be a driver bug or hw bug. The following patch avoids the
problem, but is a bit ugly. :-(
David Xu
Index: ac97.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/sound/pcm/ac97.c,v
retrieving revision 1.46
diff -u -r1.46 ac97.c
--- ac97.c 29 Aug 2003 03:24:08 -0000 1.46
+++ ac97.c 29 Aug 2003 14:28:03 -0000
@@ -454,7 +454,12 @@
* We first check whether aux_out is a valid register. If not
* we may not want to keep ogain.
*/
- keep_ogain = ac97_rdcd(codec, AC97_MIX_AUXOUT) & 0x8000;
+
+ /* Creative EV1938 codec read has side effect ? */
+ if (codec->id == 0x1408384)
+ keep_ogain = 1;
+ else
+ keep_ogain = ac97_rdcd(codec, AC97_MIX_AUXOUT) & 0x8000;
/*
* Determine what AUX_OUT really means, it can be:
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