Dell UltraSharp U4924DW User Manual page 56

NOTE: You can enable or disable the power button sync function using
the OSD. See
• When the monitor and the PC power state are both ON, press and hold
the monitor power button for 4 seconds, the screen prompt will ask if
you would like to shut down the PC.
• When the monitor and the PC power state are both ON, press and hold the
monitor power button for 10 seconds, the PC will shut down.
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56 Setting up the monitor
Dell Power Button Sync.