[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 #16 from Alan Stern (stern@rowland.harvard.edu) ---
There's something wrong with what you did, but I can't tell what.  To start
with, before ehci-pci.ko was loaded there should have been no usbmon/3u or
usbmon/4u files, so your cat commands should have failed.  Those filenames
correspond directly to the USB bus numbers, and your lsusb output shows only
buses 1 and 2.

For another, the device numbering is off.  On bus 3, device 1 is the root hub
and device 2 is the integrated hub -- fine.  But then the Foxconn and Ricoh
devices should have been numbers 3 and 4, not 6 and 7.  Clearly something
happened before you started your monitoring.

Also, your usbmon3 trace shows the webcam working after it was initialized
using the old scheme!  It's pretty hard to tell what that means, though,
especially since the actions shown in the trace probably weren't the first time
the webcam had been initialized since the last cold reboot.

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