Re: font-lock-comment-delimiter-face

[Richard Stallman]

    It is the backlight that is consuming the bulk of the power, not the
    color cells.  So if you are worried about battery power, you should be
    using only black and white and turn the backlight down as much as
    possible with this setting.

The keyboard has functions to raise and lower the brightness; how
would I control the backlight separately?  (What exactly is the
backlight, anyway?)