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VPCSA3T9E Why can't I change the screen brightness from the system or hotkeys?

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acarlisle28
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VPCSA3T9E Why can't I change the screen brightness from the system or hotkeys?

Before it was a constant problem i couldn't change the brightness when my laptop was set on speed mode. Now it stays on the lowest brightness setting in both modes.

When i try to change it with the hotkeys on stamina mode 1 bit goes on and off as i change it but the brightness stays the same, on speed mode this doesn't happen. The indictator that appears on the screen says (Auto) so i tried disabling adaptive brightness but nothing changed.

It's been like this for the past 4 months can anyone help?

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