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    Subject[PATCH 4.9 06/14] ALSA: usb-audio: Add mute TLV for playback volumes on RODE NT-USB
    Date
    From: Lars-Peter Clausen <lars@metafoo.de>

    commit 0f306cca42fe879694fb5e2382748c43dc9e0196 upstream.

    For the RODE NT-USB the lowest Playback mixer volume setting mutes the
    audio output. But it is not reported as such causing e.g. PulseAudio to
    accidentally mute the device when selecting a low volume.

    Fix this by applying the existing quirk for this kind of issue when the
    device is detected.

    Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
    Cc: <stable@vger.kernel.org>
    Link: https://lore.kernel.org/r/20220311201400.235892-1-lars@metafoo.de
    Signed-off-by: Takashi Iwai <tiwai@suse.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    sound/usb/mixer_quirks.c | 7 ++++---
    1 file changed, 4 insertions(+), 3 deletions(-)

    --- a/sound/usb/mixer_quirks.c
    +++ b/sound/usb/mixer_quirks.c
    @@ -1879,9 +1879,10 @@ void snd_usb_mixer_fu_apply_quirk(struct
    if (unitid == 7 && cval->control == UAC_FU_VOLUME)
    snd_dragonfly_quirk_db_scale(mixer, cval, kctl);
    break;
    - /* lowest playback value is muted on C-Media devices */
    - case USB_ID(0x0d8c, 0x000c):
    - case USB_ID(0x0d8c, 0x0014):
    + /* lowest playback value is muted on some devices */
    + case USB_ID(0x0d8c, 0x000c): /* C-Media */
    + case USB_ID(0x0d8c, 0x0014): /* C-Media */
    + case USB_ID(0x19f7, 0x0003): /* RODE NT-USB */
    if (strstr(kctl->id.name, "Playback"))
    cval->min_mute = 1;
    break;

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