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When I press Fn + Brightness Up/Down, I see the brightness graphic go up and down, but the screen's brighgtness doesn't actually change.
On the other hand, changing /sys/class/backlight/intel_backlight/brightness manually changes the backlight appropriately. I have acpi_backlight=intel_backlight in my grub.cfg (but these keys were not working prior to my adding it).
How can I keep the brightness graphic while also changing the appropriate value when pressing the brightness keys?
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