iMac Waking from Sleep
iMac (Retina 4K, 21.5-inch, Late 2015)
Intel Iris Pro Graphics 6200 1536 MB
3 monitor display
Monitor using display link is the only monitor to 'wake up' and show anything on screen after coming back from sleep mode.
The main monitor and a second monitor (run through thunderbolt) show a black screen as if they are still asleep.
Unplugging and plugging display link USB fixes the issue, but it's very inconvenient.
Wanted to report. Thx
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