Tahoe 26.5 Display Calibration Still Does Not Work

[smithdr]

MacOS Tahoe 26.4 released display calibration which worked on an M1Max MBP16. Then, Apple released 26.4.1 which broke display calibration. I just updated to Tahoe 26.5 with the hope that Apple fixed display calibration with this semi-major update. Did Apple fix it?. Nope! Same display calibration failures as with 26.4.1. Gee Apple. Do you not vaildate your software before releasing to the public? Guess not.

 

[OldMacs4Me]

I used to be able to create an asr disk image before updating. If the update screwed up it was about 10 minutes to get back to where I started. Now it is obscenely complex. Unless I'm missing something you need to download (Edit: and save) the complete installer for every update. Then do a bootable clone before running the update. If the update proves bad you need to go back to the previous installer, boot from recovery and completely erase, then install the OS from that earlier installer. Finally recovering your files via migration assistant and your clone. Can possibly also use Time Machine but I would personally be more comfortable working from a clone.

If there is a simpler way, please I would love to know what it is!

 

[smithdr]

I used to be able to create an asr disk image before updating. If the update screwed up it was about 10 minutes to get back to where I started. Now it is obscenely complex. Unless I'm missing something you need to download the complete installer for every update. Then do a bootable clone before running the update. If the update proves bad you need to go back to the previous installer, boot from recovery and completely erase, then install the OS from that earlier installer. Finally recovering your files via migration assistant and your clone. Can possibly also use Time Machine but I would personally be more comfortable working from a clone.

If there is a simpler way, please I would love to know what it is!

Hi OldMac:

I am confused. What are you suggesting that I do to get Display Calibration to work in MacOS 26.5?

Don

 

[OldMacs4Me]

Hi OldMac:

I am confused. What are you suggesting that I do to get Display Calibration to work in MacOS 26.5?

Don

Historically when an OS update broke something critical, there were easy & safe ways to get back to the previous version that worked correctly for you. This did require creating an external bootable clone of the OS before updating. You could then simply clone back to the computer in the event of a fail. I also made an asr disk image, which took additional time but made recovery much faster, however for just one computer that extra step was not needed.

Was trying to say that with Sequoia and now Tahoe to go back a step, you have to do a complete scratch reinstall of that earlier system as the security features do not allow simply booting from the external clone and cloning back to the main drive. If you have not saved that earlier complete installer you have to download it again (if it's still available) and install it from the recovery partition which will erase everything on the main drive. Therefore you'll still need an external clone to recover your files via migration assistant. The time to make and test that clone is just before you run any update. That's a brute force but typically time saving approach.

In your case the first step is to create a new user account and give it admin privileges. Then see if the Display calibration works from the new account. If that fails you need to contact Apple and let them know what the problem is, then pray that two or three updates down the road they fix it.

 

[smithdr]

Thank you.