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I have a brand new MacBook Pro (2018) with two external monitors (AOC Q2790PQU), connected via a Kensington SD5200T docking station (1 x HDMI and 1 x DisplayPort).

The Mac is closed when connected to the docking station.

Whenever I lock my screens, after seeing the login screen for some seconds, both external monitors turn off (go black). I would like the monitors to remain on, showing the login screen.

Does there exist a setting for this somewhere?

Also, for some reason, when I press some keys on my keyboard or move the mouse to wake up the monitors (the Mac itself is not sleeping), then only one of the monitors will turn back on.

In order to get the other monitor to turn back on, I need to open the Mac lid, disconnect and reconnect the docking station, and then close the lid of the Mac.

Does anyone have any ideas why this is happening and how to fix it?

  • what is the behavior if you don't close the lid of the MBP? – dwightk Feb 8 at 14:01
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    If I open the lid of the MBP, then all three monitors will remain on at the same time. Due to lack of desk space and too low height on the external monitors, I need to close the lid of the MBP. – Leif Feb 8 at 14:02

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