| From | Greg Kroah-Hartman <> | Subject | [ 13/79] ALSA: usb-audio - Fix invalid volume resolution on Logitech HD webcam c270 | Date | Tue, 11 Jun 2013 13:02:39 -0700 |
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3.9-stable review patch. If anyone has any objections, please let me know.
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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.
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