https://bugzilla.kernel.org/show_bug.cgi?id=62891

--- Comment #13 from Aaron Lu <[email protected]> ---
Any value that is less than max_brightness is a valid value to echo. Please
note that for intel_backlight interface, if the value echoed is too small, the
screen may be very dark, and a 0 would normally turn off the backlight, so
avoid those values or you will have to type blindly.

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