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| author | Takashi Iwai <tiwai@suse.de> | 2017-08-16 14:18:37 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-08-17 17:52:16 +0200 |
| commit | 0f174b3525a43bd51f9397394763925e0ebe7bc7 (patch) | |
| tree | f13262060f55267e5740e1cea1ad979e36813f4a /sound/usb/mixer.c | |
| parent | ALSA: usb-audio: Apply sample rate quirk to Sennheiser headset (diff) | |
| download | linux-0f174b3525a43bd51f9397394763925e0ebe7bc7.tar.xz linux-0f174b3525a43bd51f9397394763925e0ebe7bc7.zip | |
ALSA: usb-audio: Add mute TLV for playback volumes on C-Media devices
C-Media devices (at least some models) mute the playback stream when
volumes are set to the minimum value. But this isn't informed via TLV
and the user-space, typically PulseAudio, gets confused as if it's
still played in a low volume.
This patch adds the new flag, min_mute, to struct usb_mixer_elem_info
for indicating that the mixer element is with the minimum-mute volume.
This flag is set for known C-Media devices in
snd_usb_mixer_fu_apply_quirk() in turn.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=196669
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/mixer.c')
| -rw-r--r-- | sound/usb/mixer.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index 082736c539bc..e630813c5008 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -542,6 +542,8 @@ int snd_usb_mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag, if (size < sizeof(scale)) return -ENOMEM; + if (cval->min_mute) + scale[0] = SNDRV_CTL_TLVT_DB_MINMAX_MUTE; scale[2] = cval->dBmin; scale[3] = cval->dBmax; if (copy_to_user(_tlv, scale, sizeof(scale))) |