[Bug 207219] [BISECTED] Sony Vaio laptop built-in ricoh webcam no longer found on Fedora 31 with 5.4.11 kernel

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207219

--- Comment #18 from Alan Stern (stern@rowland.harvard.edu) ---
Okay.  You need to start the usbmon data collection _before_ you do the insmod,
so that the trace can capture _all_ of the USB traffic.  And since the
usbmon/4u file doesn't exist before you do the insmod, you will have to capture
the trace from the usbmon/0u file instead (that file reports all the USB
traffic on all the buses).

Also, it wouldn't hurt to get a copy of the system log showing what happens
when you run the test.  Before running insmod, do:

   dmesg -C >/dev/null

After you run insmod, wait a little while (something like 10 seconds), then
stop the usbmon trace, and do:

  dmesg >logfile.txt

You don't even need to do the writes to the bConfigurationValue file.  Let's
see what the usbmon trace and the logfile show.

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