Since I have my WD My Cloud 6TB Ethernet connected to my Mac mini via my SpeedTouch Router, I am experiencing this problem:
My displays refuse to go to sleep and screen savers don’t work.
I got the proof that WD My Cloud is the culprit by using the following command line in Terminal:
pmset -g assertions
Assertion status system-wide:
Listed by owning process:
15: ExternalMedia value=255 named: “com.apple.powermanagement.externalmediamounted”
When using this command line, WD My Cloud was the only one disk connected to my Mac.
Do you have a solution or a workaround?
Many thanks in advance for your valuable suggestions, tips or advices!