releases/3.6.2/alsa-usb-disable-broken-hw-volume-for-tenx-tp6911.patch

   1 From c10514394ef9e8de93a4ad8c8904d71dcd82c122 Mon Sep 17 00:00:00 2001
   2 From: David Henningsson <david.henningsson@canonical.com>
   3 Date: Thu, 20 Sep 2012 10:20:41 +0200
   4 Subject: ALSA: usb - disable broken hw volume for Tenx TP6911
   5
   6 From: David Henningsson <david.henningsson@canonical.com>
   7
   8 commit c10514394ef9e8de93a4ad8c8904d71dcd82c122 upstream.
   9
  10 While going through Ubuntu bugs, I discovered this patch being
  11 posted and a confirmation that the patch works as expected.
  12
  13 Finding out how the hw volume really works would be preferrable
  14 to just disabling the broken one, but this would be better than
  15 nothing.
  16
  17 Credit: sndfnsdfin (qawsnews)
  18 BugLink: https://bugs.launchpad.net/bugs/559939
  19 Signed-off-by: David Henningsson <david.henningsson@canonical.com>
  20 Signed-off-by: Takashi Iwai <tiwai@suse.de>
  21 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  22
  23 ---
  24  sound/usb/mixer.c |    7 +++++++
  25  1 file changed, 7 insertions(+)
  26
  27 --- a/sound/usb/mixer.c
  28 +++ b/sound/usb/mixer.c
  29 @@ -1267,6 +1267,13 @@ static int parse_audio_feature_unit(stru
  30                 /* disable non-functional volume control */
  31                 master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
  32                 break;
  33 +       case USB_ID(0x1130, 0xf211):
  34 +               snd_printk(KERN_INFO
  35 +                          "usbmixer: volume control quirk for Tenx TP6911 Audio Headset\n");
  36 +               /* disable non-functional volume control */
  37 +               channels = 0;
  38 +               break;
  39 +
  40         }
  41         if (channels > 0)
  42                 first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, csize);