XPost: linux.debian.bugs.dist   
   From: brouits@free.fr   
      
   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.ker   
   el.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   
   >   
      
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