Dell C1422H User Manual page 19

NOTE:When connecting 90W or above adapter, Maximum power delivery
output from the monitor is 65W.
When connecting 65W adapter, Maximum power delivery output from the
monitor is 45W.
When connecting 45W adapter, Maximum power delivery output from the
monitor is 30W.
When connecting <30W adapter, Maximum power delivery output from the
monitor is 7.5W.
The Dell monitor C1422H can only output a maximum of 65W to the system.
If the system requires 90W or above, it will need 90W or above adapters
connected to the system or the battery will drain during usage.
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Setting up the monitor 19