Control: tags -1 + moreinfo 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: [email protected] > > 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
