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Bug#1121718: linux-image-6.17.8+deb14-amd64: Logitech C920 HD Pro Webcam shows flickering artifacts (sometimes)



Hello Ralf,

On Tue, Dec 02, 2025 at 06:36:38PM +0100, Ralf Jung wrote:
> > If you reliably can reproduce the issue then (although I realize that
> > each testing step is time consuming), I would suggest to start a
> > bisect.
> 
> Unfortunately I cannot reproduce it alone, I need someone else to be in the
> Zoom room. Also, I only have that webcam in the office, and I shouldn't
> spend hours of my employer's time on bisects. ;)  I guess I could take it
> home over a weekend or so, but I'd still need a way to reproduce the issue
> alone, and find a weekend day where I have nothing else to do.

I would try to wireshark the USB traffic. I guess that results in quite
some amount of logs, but someone who is more familiar with USB and
webcams might spot the relevant USB transfer that triggers the issue.

And even if that doesn't help to immediately spot the problem it might
help to reproduce the problem and thus make a bisection possible.

Best regards
Uwe

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