http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/usb/mixer.c
/* USB descriptions contain the dB scale in 1/256 dB unit
* while ALSA TLV contains in 1/100 dB unit
*/
cval->dBmin = (convert_signed_value(cval, cval->min) * 100) / 256;
cval->dBmax = (convert_signed_value(cval, cval->max) * 100) / 256;
switch (cval->mixer->chip->usb_id) {
case USB_ID(0x0d8c, 0x6):
if (!strcmp(kctl->id.name, "Speaker Playback Volume")) {
you need to overwrite cval->dBmin and cval->dBmax for the Speaker
Playback volume
}
break;
}
if (cval->dBmin > cval->dBmax)
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Bugs, which is subscribed to Ubuntu.
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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https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1200925/+subscriptions
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