High Sierra external display no video input after waking up from sleep

Number:rdar://36151011 Date Originated:20.12.2017
Status:Open Resolved:
Product:macOS Product Version:10.13.2
Classification:Serious bug Reproducible:Sometimes
Sometimes when I wake my MacBook Air from sleep and connect DELL UP2716D to miniDP port there is no image on Dell display. System Preferences -> Displays on MBA screen shows Dell display is connected. Dell display displays 
"no signal" message.

Steps to Reproduce:
1. Wake MacBook Air from sleep
2. Connect  DELL UP2716D

Expected Results:
Screen shows my desktop as expected

Actual Results:
Sometimes systems detects Dell display switches configuration but there is no image on Dell screen. Disconnection and reconnecting display does not help. I have to reboot macOS to fix this.

10.13.2 (17C88)


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