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Bug#1133383: linux-image-amd64: Webcam fails to stream (uvcvideo URB -19 error) on kernel 6.12

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On Sun, Apr 12, 2026 at 11:19:34PM +0530, LUCIAN wrote:
> Package: linux-image-amd64
> Version: 6.12.74-2
> Severity: important
> X-Debbugs-Cc: ky80jqllj@mozmail.com
> 
> Dear Maintainer,
> 
> System: Debian Trixie (KDE Plasma)
> Kernel: 6.12.74+deb13+1-amd64
> Device: Internal HP Wide Vision HD Camera (USB ID: 30c9:0069)
> 
> Issue:
> The internal webcam is detected but fails to stream video.
> 
> Details:
> - /dev/video0 and /dev/video1 are present
> - v4l2-ctl shows MJPG and YUYV formats correctly
> - Applications such as Cheese, ffplay, and Signal show a black screen
> - Camera starts but immediately disconnects
> 
> Kernel logs show repeated errors:
> uvcvideo: Failed to resubmit video URB (-19)
> 
> This is followed by repeated USB device reinitialization.
> 
> libcamera:
> - cam -l detects the camera correctly
> - cam -c1 opens the camera but no preview/output is shown
> 
> Troubleshooting performed:
> - Disabled USB autosuspend
> - Reloaded uvcvideo with quirks
> - Forced MJPEG and YUYV formats
> - Reduced resolution and FPS
> - Tested multiple applications
> - Issue persists in all cases
> 
> Result:
> Camera stream fails immediately after initialization and repeatedly disconnects.
> 
> Conclusion:
> This appears to be a regression in the uvcvideo driver or kernel 6.12 affecting this webcam.
> 
> Expected behavior:
> The camera should stream video normally via V4L2 and libcamera.

As you concluded this is a regression, which is the previous last
kernel which worked without problems? Identified that, can you please
do a bisect of the respective 6.12.y upstream stable versions from the
last known good to 6.12.74?

if you need instructions on how to do the bisect, let me know.

Regards,
Salvatore

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Bug#1133383: linux-image-amd64: Webcam fails to stream (uvcvideo URB -19 error) on kernel 6.12 LUCIAN <ky80jqllj@mozmail.com> - 2026-04-12 20:00 +0200
  Bug#1133383: linux-image-amd64: Webcam fails to stream (uvcvideo URB -19 error) on kernel 6.12 Salvatore Bonaccorso <carnil@debian.org> - 2026-04-12 21:00 +0200

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