Lexmark MX812
To save energy, or if you have trouble reading the display, adjust its brightness settings.
Using the Embedded Web Server
Open a Web browser, and then type the printer IP address in the address field.
Notes:
Click Settings > General Settings.
In the Screen Brightness field, enter the brightness percentage you want for the display.
Click Submit.
Run the software installer to get your printer up and running.
Updating the printer firmware to latest version.