Target display mode

[laliastudiocedric]

Hi
I use my 2011 iMac as a target display with target display mode with MacBook Pro.
Is target display always available on Catalina ?

 

[laliastudiocedric]

Anyone can help me ? i waiyt for this crucial information to install new MAC OS.

Thanks

 

[laliastudiocedric]

Nobody?

 

[Rivvvers]

To my knowledge Catalina isnt supported on imacs before the 2012 models

 

[McTinker]

For what it's worth, a year after your stating the question; I have an 27" iMac 2012 run-in 10.15.6, connected to a MacBook Air 2017, also running 10.15.6, with a Apple thunderbolt 2 cable, and Target Display Mode works!
I have the impression that it works after the last update to 10.15.6 though.

 

[Gaberdine]

I'm currently using my 2013 iMac 27" running Catalina in TDM connected to a 2015 MacBook Air running High Sierra.

However, TDM only works when I'm not logged into a user account on the Catalina iMac. Either log out, switch user (without logging out), or just don't log in at all - it all works perfectly. However, switching to TDM from a logged in user account in Catalina doesn't display anything - the screen simply goes dark, despite the other Mac recognising that there is a display attached (it shows up in Displays System Pref). This is my experience of it. FWIW I'm connecting through a Thunderbolt dock, rather than directly.

So it works, but you can't run the TDM Mac as a headless machine in the background (as you could in eg High Sierra). Shame, as I used to run my iTunes from an earlier iMac in TDM.

In my experience, the Catalina Mac can connect to another Mac in Target Display mode - and I see no reason why it wouldn't, despite Apple saying it won't work.

 

[Gaberdine]

Update on my earlier comment

As of yesterday, TDM is now working even when logged into a Catalina user account.

I cannot fully account for this, but I suspect it is to do with changes made in recent security updates.