Gain setting not persistent

[MarcGyongyosi]

Hi,

I am trying to use this driver for a usb_cam (Logitech C920). I manually configured exposure, set auto_exposure to 0 and set gain to a specific value. When the camera starts up, the image looks good and running v4l2-ctl -d /dev/video2 --all shows the correct settings.

However, after running the driver for several hours, the gain setting seems to change on its own. Is there a way to fix this?

Thanks! Marc