Brightness problem

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Okay, I think this started happening after updating to 10.6.8. But whenever I take a break from my laptop, I put the brightness to zero and leave the laptop to 'sleep' without putting the cover down. However, sometimes the brightness just turns up automatically by itself and then I have to press the 'lower brightness' to make it zero again. Why does this happen? And does anyone know how to fix? Wasting my battery.
 

chscag

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Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
Try resetting the System Management Controller (SMC) as it controls the brightness settings. See this Apple KB article.
 

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