From: Takashi Iwai Date: Wed, 5 Jun 2013 06:35:26 +0000 (+0200) Subject: ALSA: usb-audio - Fix invalid volume resolution on Logitech HD webcam c270 X-Git-Tag: v3.9.6~67 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ec2198fa4e2ba98b2fbbc20eb280b9ff389680e;p=thirdparty%2Fkernel%2Fstable.git ALSA: usb-audio - Fix invalid volume resolution on Logitech HD webcam c270 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 Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c index ca4739c3f6502..e5c7f9f20fddb 100644 --- a/sound/usb/mixer.c +++ b/sound/usb/mixer.c @@ -886,6 +886,7 @@ static void volume_control_quirks(struct usb_mixer_elem_info *cval, 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.