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Microsoft Windows 10 (64-bit)

I am using a HP Probook 450 G7, connected it up to new monitors:

a) a HP E27m G4 hub monitor via USB-C, which is itself connected to 

b) a HP E27 G4, via DisplayPort.

 

When the laptop/monitors go to sleep, I first get a warning (which is fine) then monitor A goes blank. Monitor B also goes blank but then pops up a message 'No input signal' detected for a few seconds, which disappears for a few seconds, and this keeps repeating. It's quite distracting if I'm on a call or trying to read something.

 

Power-saving mode is enabled on the monitor.

 

How can I stop this popup (other than by disabling power saving)?

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