I created a new user called "kiosk" on my machine. I set it up to load a specific web page in Google Chrome fullscreen kiosk mode. This works fine, but this issue I am having is that when I log in to the kiosk user in kiosk mode, I have no control over screen brightness or audio volume. If I log in as the kiosk user in Lubuntu mode (by clicking the icon near the upper right corner at the login screen) both of these work fine.
How do I set it up so both of these work in kiosk mode?