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ALSA: usb-audio: Disable Lenovo P620 Rear line-in volume control

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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.

Fixes: f8c11eb7da ("ALSA: usb-audio: Add support for Lenovo ThinkStation P620")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20200810133108.31580-1-kai.heng.feng@canonical.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kai-Heng Feng 2020-08-10 21:31:06 +08:00 committed by Takashi Iwai
parent 6e8596172e
commit 34dedd2a83
1 changed files with 1 additions and 0 deletions
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sound/usb/mixer_maps.c
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@ -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 */
{}
};