At Wed, 30 Jan 2013 09:25:27 +0100,
Mika Fischer wrote:
>
> On Wed, Jan 30, 2013 at 8:40 AM, Clemens Ladisch
> <[email protected]> wrote:
> >> I'd also be happy with a config file hack, that somehow scales the
> >> volume down and adjusts the reported gain levels so that the volume
> >> controls in pulseaudio make sense again.
> >
> > This is possible, but only if we know what values to use.
> >
> > What are the smallest steps you can change with amixer?
>
> The smallest increments I could produce with amixer are:
> Playback 0 [0%] [-37.00dB]
> Playback 1 [3%] [-36.00dB]
> Playback 2 [5%] [-35.00dB]
> Playback 3 [8%] [-34.00dB]
> Playback 4 [11%] [-33.00dB]
> Playback 5 [14%] [-32.00dB]
>
> cget outout is:
> numid=2,iface=MIXER,name='PCM Playback Volume'
> ; type=INTEGER,access=rw---R--,values=2,min=0,max=37,step=0
> : values=5,5
> | dBminmax-min=42949635.96dB,max=0.00dB
Oh then this must be a bug in TLV handling in usb-audio driver.
What shows with the patch below?
Takashi
---
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index e90daf8..ab8cbf7 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -986,6 +986,7 @@ static int get_min_max_with_quirks(struct
usb_mixer_elem_info *cval,
*/
cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
+ printk("XXX dB=%d/%d, raw=%d/%d res=%d\n", cval->dBmin, cval->dBmax,
cval->min, cval->max, cval->res);
if (cval->dBmin > cval->dBmax) {
/* something is wrong; assume it's either from/to 0dB */
if (cval->dBmin < 0)
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