brightness setting in camera.txt is being ignored about uvc-gadget HOT 4 CLOSED

I reported this issue originally here

from uvc-gadget.

Your journalctl log contains information about available video controls and mapping between v4l2 and UVC.

• camera control V4L2_CID_BRIGHTNESS is available and is mapped to UVC_PU_BRIGHTNESS_CONTROL
  V4L2: Supported control Brightness (V4L2_CID_BRIGHTNESS = UVC_PU_BRIGHTNESS_CONTROL)

• range of values available for V4L2_CID_BRIGHTNESS
  V4L2: V4L2: min: 0, max: 100, step: 1, default: 50, value: 50

• range of values propagated to host computer if UVC_PU_BRIGHTNESS_CONTROL is requested.
  V4L2: UVC: min: 0, max: 100, step: 1, default: 50, value: 50

If host computer need to change brightness, then tou can see in log messages like this -
UVC: PROCESSING_UNIT - GET_CUR - UVC_PU_BRIGHTNESS_CONTROL
UVC: PROCESSING_UNIT - GET_CUR - UVC_PU_BRIGHTNESS_CONTROL
UVC: PROCESSING_UNIT - SET_CUR - UVC_PU_BRIGHTNESS_CONTROL
UVC: Control CONTROL_UNDEFINED, length: 2
DEVICE_UVC: V4L2_CID_BRIGHTNESS changed value (V4L2: 54, UVC: 54)

Your journalctl doesn't contain a message like "DEVICE_UVC: V4L2_CID_BRIGHTNESS changed value (V4L2: 54, UVC: 54)", so uvc-gadget don't change brightness.

from uvc-gadget.

I'm encountering the same problem. Other settings in the camera.txt are being honored, but the 'brightness' value is ignored. I have to set it manually using the serial interface each time I connect the webcam.

from uvc-gadget.

In branch new-code https://github.com/peterbay/uvc-gadget/tree/feat/new-code is now added argument -z for ignoring controls from v4l2 source device and host computer.

from uvc-gadget.