Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 61)

Operating the monitor
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When you change the default setting of power saving features for the first time,
such as
USB-C Charging 90W , Other USB Charging , Uniformity
Compensation , or Fast Wakeup , the following message appears:
NOTE: If you select Yes for either of the features mentioned above, the
message will not appear the next time you intend to change the
settings of these features. When you perform a factory reset, the
message will appear again.
When the monitor goes into Standby mode, the following message appears:
Activate the computer and wake up the monitor to gain access to the OSD .
The OSD functions only in the normal operation mode. If you press the joystick
during the Standby mode, the following message will appear depending on the
selected input:
Activate the computer and the monitor to gain access to the OSD .
NOTE: The message may be slightly different according to the
connected input signal.