kern/158979: [snd_uadio] snd_uaudio fails to initialize built-in microphone in Logitech Webcam C160

[Hans Petter Selasky]

The following reply was made to PR kern/158979; it has been noted by GNATS.

From: Hans Petter Selasky <hselasky at c2i.net>
To: Dmytro Pryanyshnikov <lynx.ripe at gmail.com>
Cc: bug-followup at freebsd.org
Subject: Re: kern/158979: [snd_uadio] snd_uaudio fails to initialize built-in microphone in Logitech Webcam C160
Date: Sun, 17 Jul 2011 11:48:40 +0200

 On Sunday 17 July 2011 11:42:43 Hans Petter Selasky wrote:
 > On Sunday 17 July 2011 11:31:25 Dmytro Pryanyshnikov wrote:
 > > Hello!
 > > 
 > > >From:	Hans Petter Selasky <hselasky at c2i.net>
 > > >Date:	Sun, 17 Jul 2011 09:45:41 +0200
 > > >Hi,
 > > >
 > > >Can you try and see if any of the quirks mentioned at the following link
 > > >
 > > >helps:
 > > > http://wiki.freebsd.org/WebcamCompat
 > > > 
 > >   Well, it helps only partially. Indeed, after
 > > 
 > > 1) plugging in my Logitech Webcam C160;
 > > 2) running 'pwcview' and exiting from it;
 > > 3) issuing 'usbconfig -d ugen4.2 do_request 0x22 0x01 0x100 0x86 0x03
 > > 0x80 0xBB 0x00'
 > > 
 > > timeout problem has gone, BUT the sensitivity of the microphone
 > > becomes very low (I could only hear knocks on the camera hull, but
 > > almost can't hear my own voice in the recorded samples). And
 > > /dev/mixer3, which corresponds to the webcam microphone, doesn't
 > > affect it's sensitivity at all:
 > > 
 > > 
 > > dmitry at lynx$ mixer -f /dev/mixer3
 > > Mixer vol      is currently set to  75:75
 > > Mixer pcm      is currently set to  75:75
 > > 
 > > dmitry at lynx$ mixer -f /dev/mixer3 vol 100 pcm 100
 > > Setting the mixer vol from 75:75 to 100:100.
 > > Setting the mixer pcm from 75:75 to 100:100.
 > > 
 > > (doesn't change mic sensitivity)
 > > 
 > > dmitry at lynx$ mixer -f /dev/mixer3 vol 0 pcm 0
 > > Setting the mixer vol from 100:100 to 0:0.
 > > Setting the mixer pcm from 100:100 to 0:0.
 > > 
 > > (doesn't change mic sensitivity)
 > 
 > Hi,
 > 
 > Can you build a kernel with "options USB_DEBUG" or when using the module to
 > build add "CFLAGS+=-DUSB_DEBUG" in the
 > sys/modules/sound/.../uaudio/Makefile ?
 > 
 > Then set:
 > 
 > sysctl hw.usb.uaudio.debug=15
 > 
 > Then plug the device and send resulting dmesg.
 > 
 > --HPS
 
 HI,
 
 If you are running this in a VM, then try using usbdump to figure out which 
 control endpoint requests are issued for this device.
 
 Probably you can make a similar usbconfig do_request line to change the 
 microphone volume back to normal!
 
 --HPS