Currently it's not possible to set volume lower than 26% (it just mutes).

Also fixes this warning:

Warning! Unlikely big volume range (=9472), cval->res is probably wrong. [13] FU [PCM Playback Volume] ch = 2, val = -9473/-1/1

, and volume works fine for full range. --- sound/usb/mixer.c | 8 ++++++++ 1 file changed, 8 insertions(+)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 344d7b069d59..bb5ab7a7dfa5 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -967,6 +967,14 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval, } break;

+ case USB_ID(0x0d8c, 0x0103): + if (!strcmp(kctl->id.name, "PCM Playback Volume")) { + usb_audio_info(chip, + "set volume quirk for CM102-A+/102S+\n"); + cval->min = -256; + } + break; + case USB_ID(0x0471, 0x0101): case USB_ID(0x0471, 0x0104): case USB_ID(0x0471, 0x0105):