2012 27" iMac used as second display for 2017 iMac 27"

[nyc2pdx]

Got my new 2017 27" iMac 5K and using my older 2012 iMac as a second display.

I have the thunderbolt 3 to thunderbolt 2 adapter, and a thunderbolt 2 cable from that to my 2012 iMac thunderbolt port.

In order to make it work, I have to put the older iMac into target display mode (CMD-3)...each time the 2017 wakes up. It is kind of annoying.

Anyone know how I could keep the 2012 in target display mode, and have it wake in target display mode when the 2017 iMac wakes up?

 

[bcortens]

I'm fairly certain that the TB3 to TB2 adaptor won't work.
https://9to5mac.com/2016/11/17/apple-macbook-pro-thunderbolt-3-adapter-displayport/
I'm not sure how you're going to be able to do it but maybe if you can find TB3->DP directly?

 

[nyc2pdx]

I'm fairly certain that the TB3 to TB2 adaptor won't work.
https://9to5mac.com/2016/11/17/apple-macbook-pro-thunderbolt-3-adapter-displayport/
I'm not sure how you're going to be able to do it but maybe if you can find TB3->DP directly?

It worked yesterday for me...but it doesn't stay. I don't have a DisplayPort on my 2012 iMac, only thunderbolt/minidisplayport

 

[Synchro3]

I'm fairly certain that the TB3 to TB2 adaptor won't work.
https://9to5mac.com/2016/11/17/apple-macbook-pro-thunderbolt-3-adapter-displayport/
I'm not sure how you're going to be able to do it but maybe if you can find TB3->DP directly?

It should work, as any Display, if you connect an additional Thunderbolt device (with independent power supply) between the Display/iMac and the Apple TB3 to TB2 adaptor: https://www.apple.com/shop/product/...140ff5d32b881f6111922ef89cc55ac67e3315f5e6a48

Quote: In addition, it can be used to connect Thunderbolt-enabled displays — such as the Apple Thunderbolt Display and LG Thunderbolt 2 displays — to any of the Thunderbolt 3 (USB-C) ports on your MacBook Pro. However, using this adapter with an Apple Thunderbolt Display requires a power source, because the display does not provide power through the adapter.

 

[joelw135]

I have a similar problem with a 2017 iMac and a Late 2013 iMac with Thunderbolt, and it doesn't work.