Advanced: Help me troubleshoot weird camera problems

For advanced users who are trying to tix weird problems

Ensure that the camera is enabled and there is enough GPU memory:

1. Add the following lines to the /boot/firmware/config.txt file:

start_x=1
gpu_mem=128

And then reboot. Note that the config.txt file will say that you should not modify it and instead make the changes in a file called userconfig.txt. However I found that the userconfig.txt file is not invoked. So I added the lines above directly to config.txt.

1. Check the amount of gpu_memory

vcgencmd get_mem gpu

It should show 256 or whatever number you put there.