Target Display Mode not working 2020 MacBook Pro (Catalina)

Hello,

I've re-read your post a couple of times to ensure I understand everything -

However, I'm not sure if I'm confused or if this is incorrect. But I want to make sure I've exhausted all my options with this issue before I go ahead and invest more money by purchasing the "astroluna pad" I've been seeing recommended on this thread.

Attempting to connect:

Early 2009 iMac as display <-> with <-> 2020 Macbook Air

I can confirm:

My Early-2009 iMac does not use a thunderbolt.

Using cmd+F2 on iMac does nothing when direct connecting with a:

USB C to Mini Displayport Cable.

Also, you mentioned a "dock". Possibly adding this (vs a direct connection) might help but I'm unsure as to what kind of dock you are using with your set-up?

Any help would be greatly appreciated! Thank you!

I'm in the same boat. I relied daily on this with my 2017 MBP, and it seems reasonable to expect that it would continue to work with the new MBP 2020. It would be good to know at least why it's been disabled, and whether there's any plan to reenable, so that those of us in this limbo can make an informed decision about how to remediate. It also seems reasonable to expect Apple to be aware of the scale of impact this would have. With all of the diagnostic data that many of us share with Apple, not to mention the popularity of the "How to use iMac as target display from MBP" topic on various forums, it's disappointing they didn't take better measures to protect users.

I'm having the same issue. I have a machine that is outdated but still good as a monitor and it's destined for landfill for NO REASON whatsoever. Shall we take this to the media perhaps? Apple is supposed to be a leader with regards to environmental practices. Very disappointed indeed.

How did you do this? I have a 2010 iMac that I want to use as a TD, and a 2020 MacBook Air. I plunked down the $100 for the Thunderbolt cable and Thunderbolt 3 to Thunderbolt 2 adapter, and it still doesn't work. Running OS 10.7.5 on the iMac and OS Catalina on the MacBook Air.

I'm having the same problem. My sibling's 2019 macbook pro works, but my 2020 one does not

If you like, you Can use screen sharing to share the screen of any Mac on your local network in a window on another Mac.

https://support.apple.com/guide/mac-help/share-the-screen-of-another-mac-mh14066/10.15/mac/10.15

.

...so if I understand well you are saying that iMac models after 2014 are supported? or Target Display Mode will no longer be possible from a MBP to any iMac?

So to have the same arrangement I have now I need to replace my two iMacs with two monitors and connect them to my 2020 MBP via HDMI. Thanks for your time and feedback.

That seems to be the situation dnssolo.

I'm trying to get hold of an old Thunderbolt Display. I've been in to see other brands monitors... wow, they're not great!

Has anyone successfully tried installing older OS to a 2020 MacBook Pro to confirm TDM works?

....does Apple read all our frustration?

Just realised this too and having the exact same problem. Very disappointing. Apple not even being compatible with itself.

Also having this issue with my new Macbook Air (10.15.7) with late 2013 iMac. Seems really wasteful, as TDM made my iMac really useful. I submitted a feature request to Apple to bring back support.

I would swap my 13in one for free as well, If I find one pre2020 with 2To ssd and 16gb ram.

It was really not the good time to get the one I bought Feb 2020 stolen.

If my burglar reads this...