Keyboard Illumination Setting in BIOS Does Not Sync with Ubuntu Operating System Settings
Сводка: This article provides information about keyboard backlight or illumination setting in BIOS not syncing with settings in Ubuntu operating system.
Симптомы
Dell computers running on Ubuntu operating system may find that the keyboard backlight or illumination settings in the BIOS does not sync with the settings in Ubuntu.

Figure 1: Screenshot of the keyboard illumination set to Bright in the BIOS.

Figure 2: Screenshot of the keyboard illumination setting in Ubuntu.
Причина
Ubuntu will not sync with the keyboard illumination setting that is in the BIOS. The operating system keeps the state which the user has set in the Ubuntu.
Разрешение
This is expected behavior in Ubuntu. The keyboard backlight or illumination settings must be set in Ubuntu. The user preferences for the keyboard backlight or illumination settings is preserved in the operating system. This does not sync with the keyboard illumination setting in the BIOS.