The workaround is to disable display sleep if affected, and rely on a screensaver which darkens much or all of the display.
This was new with 10.12.4, persisted in 10.12.5, and fixed only for some users in 10.12.6.
So far the only way to restore a normal image on the internal display is to restart. Although the external displays wake normally, the iMac display does not. Note, though, that those are no longer maintained.ĭisplay sleep – multiple display setups may not wake properly after sleepĪ few users, mainly with iMac 5K models, are reporting that allowing display sleep with one or more external displays connected causes problems when waking. If you are looking for a list of bugs in previous versions of Sierra, that for 10.12.5 is here, for 10.12.4 is here, for 10.12.3 is here, for 10.12.2 is here, for 10.12.1 is here and for 10.12 is here. Note that bad features, poor interface design, and problems with third-party apps, etc., are listed separately here.
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