| From 11e7064f35bb87da8f427d1aa4bbd8b7473a3993 Mon Sep 17 00:00:00 2001 |
| From: Takashi Iwai <tiwai@suse.de> |
| Date: Wed, 5 Jun 2013 08:35:26 +0200 |
| Subject: ALSA: usb-audio - Fix invalid volume resolution on Logitech HD webcam c270 |
| |
| From: Takashi Iwai <tiwai@suse.de> |
| |
| commit 11e7064f35bb87da8f427d1aa4bbd8b7473a3993 upstream. |
| |
| USB audio driver spews an error message when probing Logitech HD |
| webcam c270: |
| ALSA mixer.c:1300 usb_audio: Warning! Unlikely big volume range (=6144), cval->res is probably wrong. |
| ALSA mixer.c:1304 usb_audio: [5] FU [Mic Capture Volume] ch = 1, val = 1536/7680/1 |
| |
| Obviously the device needs a fixed volume resolution (cval->res = 384) |
| like other Logitech devices. |
| |
| Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=821735 |
| |
| Reported-and-tested-by: Cristian Rodríguez <crrodriguez@opensuse.org> |
| Signed-off-by: Takashi Iwai <tiwai@suse.de> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| sound/usb/mixer.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/sound/usb/mixer.c |
| +++ b/sound/usb/mixer.c |
| @@ -886,6 +886,7 @@ static void volume_control_quirks(struct |
| case USB_ID(0x046d, 0x0808): |
| case USB_ID(0x046d, 0x0809): |
| case USB_ID(0x046d, 0x081d): /* HD Webcam c510 */ |
| + case USB_ID(0x046d, 0x0825): /* HD Webcam c270 */ |
| case USB_ID(0x046d, 0x0991): |
| /* Most audio usb devices lie about volume resolution. |
| * Most Logitech webcams have res = 384. |
