Thanks for your response and solution!
I changed all the settings at the time, and I boot from the Mac mini and not from the external NVMe drive.
This didn't solve the problem, so I consulted with the AI for another solution, which I'll detail below:
Solution: Restarting the graphics server using a shortcut (macOS)
What is the problem?
When turning on the Mac or waking it from sleep, sometimes the communication through the Thunderbolt port with the Apple Studio Display doesn't correctly initialize the monitor driver, leaving the brightness locked at maximum and unresponsive from the system controls.
What is the solution?
The solution involves creating an executable shortcut from the menu bar or Dock that forces an instant restart of the macOS graphics subsystem (Windows Server), forcing the system to re-identify the display and reset its native brightness controls without needing to restart the entire Mac.
How does it work internally?
Execution Command: The shortcut runs a shell script with the command `killall -9 WindowServer`.
Restarting the Graphics Engine: The WindowServer process is responsible for rendering the entire macOS graphical interface and managing the profiles of connected monitors.
Resetting the Thunderbolt Handshake: By forcing its closure, macOS restarts the service in a matter of seconds. This brief blink forces the Mac to perform a new handshake with the internal chip of the Studio Display.
Result: The brightness protocol synchronization is restored, and the display regains native control via the function keys or Control Center.
When this command is executed, the user session closes securely and returns to the login screen, requiring the password to be entered only once to return to the desktop with the brightness now corrected.
It's a bit of a hassle, but it's the only solution that works.
