I found this to be my solution. https://youtu.be/LlXx9yVfQ0k

Again, as above, the solution is a modification to /boot/config.txt

Thanks for this. Mine was doing the same thing. I thought it was the driver. I had mine set at 1280x960 (because we all want the highest res possible right?). I changed it to 1024x640 and it seemed to work.

Thanks. That's useful info - not only for me but other forum users.

I am experimenting with a Raspberry Pi camera model V2. I am using motion with the v4l2 driver (I installed motion from the standard repositories, not from Github). I notice that the camera has a lot of problems with low light and bright (outdoors) conditions. I have tried enabling auto brightness i...

Thanks so much. It was that problem. After checking this I found that I had "bcm2835-v412" listed in /etc/modules instead of "bcm2835-v4l2". After changing this typo it works now.

I am running Raspbian Stretch on my RPi 3. I installed motion from the standard repos. I am using the Raspberry Pi Camera v2. I start motion and get the grey screen with the embedded text "Unable to open video device since" and the time the motion service was started. The camera works fine...