[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 #4 from Alan Stern (stern@rowland.harvard.edu) ---
In fact, I think your problem isn't caused by commit 7cbdf96cda1f at all.  It's
caused by commit bd0e6c9614b9 ("usb: hub: try old enumeration scheme first for
high speed devices").  The bisection settled on 7cbdf96cda1f because the bug it
fixed was hiding your real problem.

Try starting with a vanilla (bad) kernel and reverting commit bd0e6c9614b9;
let's see if that fixes the camera problem.

Incidentally, the usbmon traces didn't help very much.  The trace under the bad
kernel showed that the camera had already gotten messed up before the trace
began, probably when the camera was probed during boot.  The camera bug (and it
is a bug in the camera, not in the kernel) showed up in the trace in two ways:
The camera connected to the USB bus at full speed instead of high speed, and
when it was connected it didn't respond to any requests.

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