In
http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/usb/mixer.c
I think your code-piece might be set better some lines above (807-905) in the
section
/* volume control quirks */
static void volume_control_quirks(struct usb_mixer_elem_info *cval,
struct snd_kcontrol *kctl)
{
...
case USB_ID(0x0d8c, 0x6):
if (!strcmp(kctl->id.name, "Speaker Playback Volume")) {
cval->min = ????
cval->max = ????
cval->res = ??? /* Maybe this is also needed */
}
break;
...
}
Where we don't need to know the dB's. I hope that's correct.
Or why did you choose this section?
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https://bugs.launchpad.net/bugs/1200925
Title:
[USB-Audio - USB Audio, playback] Playback problem Playback only at
maximum level, if the volume is turned down just a little no sound is
played.
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