ALSA: usb - disable broken hw volume for Tenx TP6911

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 <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 4f40ba82316316fdad18839c1bc906af2a2af66f..fe56c9da38e9e6c78cdd6706f09e9639d8a502ab 100644 (file)
--- 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);