You might try uvcdynctl that is what I have been using as it directly
talks to the webcam.

It will show the controls that exist and let you query and set them.

On Thu, Mar 11, 2021 at 4:14 PM Ed Greshko <ed.gres...@greshko.com> wrote:
>
> On 12/03/2021 05:24, Paul Smith wrote:
> > ---------------------------------------
> > #  v4l2-ctl -l
> > User Controls
> >
> >                      keep_format 0x0098f900 (bool)   : default=0 value=0
> >                sustain_framerate 0x0098f901 (bool)   : default=0 value=0
> >                          timeout 0x0098f902 (int)    : min=0 max=100000
> > step=1 default=0 value=0
> >                 timeout_image_io 0x0098f903 (bool)   : default=0 value=0
> > #
> > ---------------------------------------
> >
> > I have only one webcam. But I am using a virtual camera via OBS Studio.
>
> AFAIK, the v4l2-ctl command gets its information from the device and/or 
> driver in use by the device.
>
> Do you know if the loss of focus_auto happen recently?  If so, try booting to 
> a previous kernel to see
> if a kernel change may have triggered it.
>
> FWIW, the webcam of my laptop has ceased working.  Old age.  And I only have 
> a USB Capture HDMI
> device on my desktop that does create both a /dev/video0 and /dev/video1.
>
> --
> People who believe they don't make mistakes have already made one.
>
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