While going through Ubuntu bugs, I discovered this patch being
posted and a confirmation that the patch works as expected.

Finding out how the hw volume really works would be preferrable
to just disabling the broken one, but this would be better than
nothing.

Credit: sndfnsdfin (qawsnews)
BugLink: https://bugs.launchpad.net/bugs/559939
Signed-off-by: David Henningsson <[email protected]>
---
 sound/usb/mixer.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 4f40ba8..fe56c9d 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1267,6 +1267,13 @@ static int parse_audio_feature_unit(struct mixer_build 
*state, int unitid, void
                /* disable non-functional volume control */
                master_bits &= ~UAC_CONTROL_BIT(UAC_FU_VOLUME);
                break;
+       case USB_ID(0x1130, 0xf211):
+               snd_printk(KERN_INFO
+                          "usbmixer: volume control quirk for Tenx TP6911 
Audio Headset\n");
+               /* disable non-functional volume control */
+               channels = 0;
+               break;
+
        }
        if (channels > 0)
                first_ch_bits = snd_usb_combine_bytes(bmaControls + csize, 
csize);
-- 
1.7.9.5

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https://bugs.launchpad.net/bugs/559939

Title:
  [USB-Audio - USB  AUDIO  ] no volume control possible with Tenx USB
  audio adapter

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