This page applies only to TC401. This feature is not currently supported on TN101.
Getting Started
This guide will walk you through lowering the minimum backlight brightness on your TC401. This will only affect minimum brightness level and will still allow for the system to be used under bright conditions as well. This can be helpful in extremely dark environments such as maritime vessels at night.
The backlight setting is controlled via a setting in a UEFI region not accessible to users. This value range from 0-255, by default this is set to 6. We can apply a BIOS update to change this setting.
An empty USB drive will be used to flash the files onto the TC401.
Update Files
Tacton Brightness Level 0 Update
Tacton Brightness Level 5 Update (Reset)
EFI BIOS Update Instructions
Download the file above for “Level 0” and use the following guide to create the auto-update media. Important reminders:
- Once the USB drive is flashed, ensure it is installed into one of the USB 2.0 ports next to the terminal block power connector. This will allow the UEFI boot manager to see the device.
- Ensure Secure Boot is disabled before attempting to update
Once the update is finished, remove the USB when prompted to do so. When booting to the operating system, you should now see that moving the brightness slider to the minimum you will see a darker screen than previously.
Additional Notes:
If you would like to reset the minimum brightness level, you can follow the steps above with the file for brightness level 5.
Additional files are available upon request for values between 1 – 4.
This setting can also be included as part of a customized BIOS by default if desired.