[alsa-devel] PCM Volume on FSC V5505
tiwai at suse.de
Tue Nov 27 16:23:08 CET 2007
At Tue, 27 Nov 2007 16:19:56 +0100,
> At Fri, 23 Nov 2007 17:45:21 +0100,
> Jan-Simon Möller wrote:
> > Hi !
> > With the patches, the sound works - well done!
> > But I need to make sure the PCM volume is max @ 50% .
> > If its over 50% sound is clipped and ugly (overload?).
> Looks like so. Mixer apps (e.g. alsamixer) can show its dB value
> instead of percent. Check the dB level shown there.
> The patch below may fix this issue. Give it a try.
Argh, the patch is wrong. Use the below instead.
diff -r 17223a4918b4 pci/hda/patch_conexant.c
--- a/pci/hda/patch_conexant.c Tue Nov 27 15:27:17 2007 +0100
+++ b/pci/hda/patch_conexant.c Tue Nov 27 16:50:37 2007 +0100
@@ -826,6 +826,17 @@ static int patch_cxt5045(struct hda_code
spec->init_verbs = cxt5045_test_init_verbs;
+ * Fix max PCM level to 0 dB
+ * (originall it has 0x2b steps with 0dB offset 0x14)
+ snd_hda_override_amp_caps(codec, 0x17, HDA_INPUT,
+ (0x14 << AC_AMPCAP_OFFSET_SHIFT) |
+ (0x14 << AC_AMPCAP_NUM_STEPS_SHIFT) |
+ (0x05 << AC_AMPCAP_STEP_SIZE_SHIFT) |
+ (1 << AC_AMPCAP_MUTE_SHIFT));
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