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Actually, the power button can do both :) If you keep the power button pressed for a bit longer, it will dim the screen. Doing the same thing again will lighten it up. In order to turn off the device, just tap the power button quickly.
This is the default behavior anyway. You can disable the dim functionality through the checkbox "light/dim screen using power button" in the "Brightness" settings ...
(Once my X30 also got into a state where the power button would only dim the screen even though this option was disabled. Don't know where this came from, but after a hard reset this problem was gone.)
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