In industrial PC (both notebook and desktop), there are product models providing backlight keyboard. It’s convenient for a user’s typing in dark environment.
However, user in bright environment will be easy to notice people around, but not in dark environment.
Thus, there is security risk while user typing the username/password in dark environment, and other people may have chance to peek easier with the user’s fingers typing on the keyboard with backlight, and without noticing people around his/her
While user typing passwords, the computer shows "*" or "●" on the display, but backlight keyboard doesn’t have any design to protect from the risk.
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INC, HP, "KEYBOARD BACKLIGHT TURN-OFF WHILE ENTERING USERNAME/PASSWORD", Technical Disclosure Commons, (December 19, 2019)