Bug#776995: snd-usb-audio: micrphone "Unlikely big volume range" with QuickCam E3500
Package: src:linux
Version: 3.2.65-1+deb7u1
Severity: normal
Tags: upstream
Dear Maintainer,
Whezy does not apply the volume_control_quirk to usb_audio. This results
in following messages in syslog:
Feb 3 17:56:10 tux kernel: [21351.605840] usbcore: registered new
interface driver uvcvideo
Feb 3 17:56:10 tux kernel: [21351.605842] USB Video Class driver (1.1.1)
Feb 3 17:56:11 tux kernel: [21352.606925] 2:3:1: cannot get freq at ep 0x86
Feb 3 17:56:12 tux kernel: [21353.296272] usb_audio: Warning! Unlikely
big volume range (=3072), cval->res is probably wrong.
Feb 3 17:56:12 tux kernel: [21353.296277] usb_audio: [5] FU [Mic
Capture Volume] ch = 1, val = 5888/8960/1
The result is the microphone beeing "dead".
The bug has been reported already on launchpad in 2012:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1265103
and has been fixed upstream on github:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/sound/usb/mixer.c?id=e182534d4bd3a779941f2868f35e1f66a8d36cea
Jessie kernel works fine and has the patched version of /sound/usb/mixer.c.
Please include the patch in next update of Wheezy kernel.
Regards,
Ingo
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