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From:   bugzilla-daemon@bugzilla.kernel.org
To:     linux-usb@vger.kernel.org
Subject: [Bug 207219] [BISECTED] Sony Vaio laptop built-in ricoh webcam no
 longer found on Fedora 31 with 5.4.11 kernel
Date:   Mon, 13 Apr 2020 17:16:14 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=207219

--- Comment #1 from Alan Stern (stern@rowland.harvard.edu) ---
You should collect usbmon traces showing what happens when the camera is
initialized, under both a good and a bad kernel.  The best way to do this is
probably:

  cat /sys/kernel/debug/usb/usbmon/1u >OUTPUT-FILENAME &
  echo 0 >/sys/bus/usb/devices/1-1/bConfigurationValue
  echo 1 >/sys/bus/usb/devices/1-1/bConfigurationValue
  ... wait a few seconds ...
  fg
  ^C

It's obvious that the camera is sending nonsense data to the system; maybe the
trace will help show why.

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