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I am not able to reduce brightness of my desktop ๐Ÿ˜ž

Not able to reduce brightness of the desktop, I have tried is not working with the button or sliders

์ด ์งˆ๋ฌธ์— ๋‹ตํ•˜๊ธฐ ์ €๋„ ๊ฐ™์€ ๋ฌธ์ œ๋ฅผ ๊ฒช๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค

์ข‹์€ ์งˆ๋ฌธ ์ž…๋‹ˆ๊นŒ?

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