ALSA: usb: mixer: volume quirk for CM102-A+/102S+

BugLink: http://bugs.launchpad.net/bugs/1782846
commit 21493316a3c4598f308d5a9fa31cc74639c4caff upstream.

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.

Signed-off-by: Federico Cuello <fedux@fedux.com.ar>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 20b28a5a145641d761fea5275dd1fa9d9895aa55..5d6cd4eb8101498db7ef2a1a0521bdc7dc3ba427 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -911,6 +911,14 @@ 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):