Keyboard backlit not automatically dim or brighten

my keyboard doesnt adjust the brightness when in low light or not in low light, it just stay in same brightness... but i could adjust the brightness in f5-f6..
i want it automatically adjust when in low light but it wont.....
already tried resetting smc and nothing works..
and also the display doesnt automatically dim or brighten even the lights on my room were off.

Resetting your Mac's PRAM and NVRAM

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