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Your message dated Thu, 22 Jan 2026 18:38:56 +0100
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and subject line Re: Bug#1121718: linux-image-6.17.8+deb14-amd64: Logitech
C920 HD Pro Webcam shows flickering artifacts (sometimes)
has caused the Debian Bug report #1121718,
regarding linux-image-6.17.8+deb14-amd64: Logitech C920 HD Pro Webcam shows
flickering artifacts (sometimes)
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1121718: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1121718
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From: Ralf Jung
To: Debian Bug Tracking System
Subject: linux-image-6.17.8+deb14-amd64: Logitech C920 HD Pro Webcam shows
flickering artifacts (sometimes)
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Date: Mon, 01 Dec 2025 10:34:52 +0100
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Package: src:linux
Version: 6.17.8-1
Severity: normal
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User: debian-amd64@lists.debian.org
Usertags: amd64
Dear Maintainer,
Since a recent kernel update, my webcam stopped working properly. The webcam
model is "Logitech C920 HD Pro" (USB ID 046d:0892); I will put the full lsusb
output below. What happens is that, when I am in a Zoom call, after someone
else
joins the call, flickering artifacts start to appear: the bottom half of the
image turns gray. I will attach an image. I have so far not been able to
reproduce this outside of Zoom. I tried Jitsi in the browser and Gnome Cheese.
(Zoom does *something* with the webcam when someone joins the call: the exact
frame of the webcam, i.e. how much of the room I see and where the image cuts
off, changes. I have no idea what that is about.)
I tried playing around with power_line_frequency; that did not help at all.
This only started recently. I tried booting a 6.12 kernel (with the same
userspace), that fixed the issue -- so it very much looks like a kernel issue
to
me. The issue is also present in 6.16, so it's a regression introduced some
time
between 6.12 and 6.16. I use Zoom fairly regularly professionally, so this bug
means I am pretty much stuck with a 6.12 kernel for now.
Kind regards,
Ralf Jung
Output of "lsusb -v -d 046d:0892":
Bus 003 Device 070: ID 046d:0892 Logitech, Inc. C920 HD Pro Webcam
Negotiated speed: High Speed (480Mbps)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 [unknown]
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x046d Logitech, Inc.
idProduct 0x0892 C920 HD Pro Webcam
bcdDevice 0.19
iManufacturer 0
iProduct 2 HD Pro Webcam C920
iSerial 1 B59E40EF
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x09c3
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 14 Video
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