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camner

macrumors regular
Original poster
Jun 19, 2009
245
18
For several years I have connected an Other World Computing Thunderbay 4 (Thunderbolt 2 version) to one port of my 2015 27" iMac while connecting a 1080p second monitor to the other Thunderbolt 2 port via a TB 2 to DisplayPort cable.

I tried daisy-chaining the second monitor to the 2nd port of the Thunderbay 4 enclosure. When I plugged it in, it worked just fine. When I put my iMac to sleep and came back a few hours later, the iMac woke up, but neither the iMac screen nor the external monitor would come back to life. But, if I unplugged the 2nd monitor from the Thunderbay enclosure and reconnected the display directly to the iMac, after about a 30 second delay, both screens lit. I did this a number of times, and it is reproducible.

Is this kind of daisy-chaining not someone one should be able to do?

[The real motivation behind the question is that I'm ordering a 2020 27" iMac, and I want to connect a TB3 external drive to one TB3 port, and want to be able to use the other port for both the TB2 Thunderbay enclosure and the 2nd monitor, but if I can't wake up the screens, that isn't going to be able to work. Which leaves me hosed in terms of what I want to be able to do with the new iMac, when it arrives]
 
Daisy chaining devices is one of the main features of Thunderbolt. It should just work.

If sleep doesn't work, then disable it. Just use display sleep.
 
Thanks for the advice. Sleep works fine...it's the waking up that doesn't! ;)
 
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