The default LCD panel mode is set in the video bios. Because notebook are mobile and the display devices can change, it is unsafe to assume that the display devices are the same between reboots. The user goes to another location without a CRT and restarts the notebook.
Many notebooks can change panel modes via a hotkey on the keyboard.
The CPL cannot know if the user has changed panel modes via the hotkey and the LCD panel mode reports by the CPL and the actual LCD panel mode can get out of sync.