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 13:01:57 +0200

 On Sunday 17 July 2011 12:33:24 Dmytro Pryanyshnikov wrote:
 > On Sun, Jul 17, 2011 at 12:48 PM, Hans Petter Selasky <hselasky at c2i.net> 
 wrote:
 > > 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!
 > 
 >   Yes, I've recorded packet interchange on the USB bus during the
 > (device) <-> (Linux kernel in the VirtualBox) data exchange with the
 > command:
 > 
 > usbdump -i usbus4 -s 0 -w 20110717_1320.dmp
 > 
 > and placed the resulting file at
 > 
 > https://sites.google.com/site/lynxripe/freebsd/pr/158979/20110717_1320.dmp
 > 
 > Alas, I haven't got sufficient USB protocol knowlege in order to
 > comprehend this data ;(
 > 
 
 Hi,
 
 I think one of the following requests should do the trick. Please let me know 
 the test result:
 
 usbconfig -d X.Y do_request 0x21 0x01 0x0200 0x0502 0x0002 0x01 0x1b
 usbconfig -d X.Y do_request 0x21 0x01 0x0200 0x0502 0x0002 0x00 0x1b
 
 --HPS