Changes are applied right away.
How bright the screen is (10% - 100%).
Your screen doesn't accept brightness over HDMI. Use the screen's own buttons.
Control system audio output level (0% - 100%).
Rotate display layout for vertical or landscape mounts.
Change display modes or mode canvas resolution.
Enable or disable secure shell command-line access. Note that the default SSH username is pi.
Type a password of at least 8 characters, then press Turn on SSH (or Enter).