The USB device (0x17aa:0x1046) that support Lenovo P620 rear panel line-in claim to support volume control, but it doens't seem to have an AMP, so when line-in volume lowers below 80, nothing gets recorded anymore.

Disable the volume control to workaround the issue.

Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com --- sound/usb/mixer_maps.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/sound/usb/mixer_maps.c b/sound/usb/mixer_maps.c index c369c81e74c4..5b43e9e40e49 100644 --- a/sound/usb/mixer_maps.c +++ b/sound/usb/mixer_maps.c @@ -371,6 +371,7 @@ static const struct usbmix_name_map asus_rog_map[] = { };

static const struct usbmix_name_map lenovo_p620_rear_map[] = { + { 19, NULL, 2 }, /* FU, Volume */ { 19, NULL, 12 }, /* FU, Input Gain Pad */ {} };