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Bug#1123619: /usr/share/bug/linux-image-6.17.11+deb14-amd64/presubj: Regression: IMC Networks USB2.0 UVC 2M WebCam found but unusable (was ok in image 6.17.9)

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Hi Salvatore,

Thank you for your reply and bissect explanation.

As a quick top-post Reply: 6.18.2-1~exp1 works for me \o/

I think, then, the bissection isn't worth it. But if you need it for the 
record, just ask me.

Thanks,
  Benoît

Le 19/12/2025 à 22:14, Salvatore Bonaccorso a écrit :
> Control: tags -1 + moreinfo upstream
> 
> Hi Benoît,
> 
> On Thu, Dec 18, 2025 at 09:37:32PM +0100, Benoît Rouits wrote:
>> Package: src:linux
>> Version: 6.17.11-1
>> Severity: normal
>> File: /usr/share/bug/linux-image-6.17.11+deb14-amd64/presubj
>> X-Debbugs-Cc: debian-amd64@lists.debian.org, brouits@free.fr
>> User: debian-amd64@lists.debian.org
>> Usertags: amd64
>>
>> Dear Maintainer,
>>
>> I am experiencing a regression in linux image 6.17.11 (works with image 6.17.9)
>>
>>     * What led up to the situation?
>>
>> Trying to use the webcam with e.g. firefox (or qv4l2 for testing purpose)
>>
>>     * What exactly did you do (or not do) that was effective (or
>>       ineffective)?
>>
>> Went to a video chat site (medical in my case).
>>
>>     * What was the outcome of this action?
>>
>> firefox did not ask permissions for integrated webcam video capture, and no
>> capture was possible.
>>
>>     * What outcome did you expect instead?
>>
>> firefox to display a popup for accepting webcam capture, and use the webcam.
>>
>>
>> When using qv4l2, the capture is a black screen.
>>
>> various CLI checks:
>>
>> $ lsusb | grep -i uvc
>> Bus 002 Device 003: ID 13d3:5205 IMC Networks USB2.0 UVC 2M WebCam
>>
>> $ sudo dmesg | grep uvcvideo
>> [    7.733171] usbcore: registered new interface driver uvcvideo
>> [ 1027.557731] uvcvideo 2-1.2:1.1: Failed to resubmit video URB (-1).
>> [ 1027.557798] uvcvideo 2-1.2:1.1: Failed to resubmit video URB (-1).
>>
>> $ v4l2-compliance | grep -5 "fail:"
>>
>> Control ioctls (Input 0):
>>          test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: OK
>>          test VIDIOC_QUERYCTRL: OK
>>          test VIDIOC_G/S_CTRL: OK
>>                  fail: v4l2-test-controls.cpp(980): ret != EINVAL (got 13)
>>          test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL
>>          test VIDIOC_(UN)SUBSCRIBE_EVENT/DQEVENT: OK
>>          test VIDIOC_G/S_JPEGCOMP: OK (Not Supported)
>>          Standard Controls: 12 Private Controls: 0
>>
>> If you need the same CLI output on the working linux image 6.17.9 for
>> comparison, or other CLI outputs, just ask me.
> 
> First of all as we will upload soon the last version from the 6.17.y
> series, 6.17.13 and then move to 6.18.y there is no much point into
> analyzing if the issue is gone with 6.18.2. Thus, can you please test
> 6.18.2-1~exp1 as uploaded to experimental and check if the problem
> persist?
> 
> If yes, and given you are able to reproduce the behaviour
> consistently, it would be great if you can bisect the problem between
> the two good and bad versions. Then we can report the problem upstream
> (and know it affects still 6.18.2). So that would involve compiling
> and testing a few kernels:
> 
>      git clone --single-branch -b linux-6.17.y https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>      cd linux-stable
>      git checkout v6.17.9
>      cp /boot/config-$(uname -r) .config
>      yes '' | make localmodconfig
>      make savedefconfig
>      mv defconfig arch/x86/configs/my_defconfig
> 
>      # test 6.17.9 to ensure this is "good"
>      make my_defconfig
>      make -j $(nproc) bindeb-pkg
>      ... install the resulting .deb package and confirm problem does not exist
> 
>      # test 6.17.11 to ensure this is "bad"
>      git checkout v6.17.11
>      make my_defconfig
>      make -j $(nproc) bindeb-pkg
>      ... install the resulting .deb package and confirm problem exists
> 
> With that confirmed, the bisection can start:
> 
>      git bisect start
>      git bisect good v6.17.9
>      git bisect bad v6.17.11
> 
> In each bisection step git checks out a state between the oldest
> known-bad and the newest known-good commit. In each step test using:
> 
>      make my_defconfig
>      make -j $(nproc) bindeb-pkg
>      ... install, verify if problem exists
> 
> and if the problem is hit run:
> 
>      git bisect bad
> 
> and if the problem doesn't trigger run:
> 
>      git bisect good
> 
> . Please pay attention to always select the just built kernel for
> booting, it won't always be the default kernel picked up by grub.
> 
> Iterate until git announces to have identified the first bad commit.
> 
> Then provide the output of
> 
>      git bisect log
> 
> In the course of the bisection you might have to uninstall previous
> kernels again to not exhaust the disk space in /boot. Also in the end
> uninstall all self-built kernels again.
> 
> Let us know on both first 6.18.2 (and then you can actually stop) or
> if it still present, if you can identify a breaking commit with the
> bisect procedure.
> 
> Regards,
> Salvatore

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Bug#1123619: /usr/share/bug/linux-image-6.17.11+deb14-amd64/presubj: Regression: IMC Networks USB2.0 UVC 2M WebCam  found but unusable (was ok in image 6.17.9) Salvatore Bonaccorso <carnil@debian.org> - 2025-12-19 22:20 +0100
  Bug#1123619: /usr/share/bug/linux-image-6.17.11+deb14-amd64/presubj: Regression: IMC Networks USB2.0 UVC 2M WebCam found but unusable (was ok in image 6.17.9) Benoît Rouits <brouits@free.fr> - 2025-12-19 23:10 +0100
    Bug#1123619: /usr/share/bug/linux-image-6.17.11+deb14-amd64/presubj: Regression: IMC Networks USB2.0 UVC 2M WebCam found but unusable (was ok in image 6.17.9) Salvatore Bonaccorso <carnil@debian.org> - 2025-12-20 14:00 +0100
      Bug#1123619: /usr/share/bug/linux-image-6.17.11+deb14-amd64/presubj: Regression: IMC Networks USB2.0 UVC 2M WebCam found but unusable (was ok in image 6.17.9) Benoît Rouits <brouits@free.fr> - 2025-12-20 23:30 +0100

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