Steps to reproduce
1. Start the device.
2. Make sure that the display backlight is set to 0%.
3. Turn off the device.
4. Start the device.
5. Set backlight to a state where it's clearly visible that it's on.
6. Press the power button once to put it in sleep mode.
7. If step 6 didn't leave the screen lit up in sleep mode, press the power button twice to once again put it in sleep mode.
At step 6 or 7, the backlight stays on for me.
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