Screen Dims When Opening Safari in Golden Gate

Re: "Screen Dims When Opening Safari in Golden Gate"

You Mac settings may automatically dim or brighten the screen in order to save resources such as power. You can control brightness settings:

Change your Mac display’s brightness - Apple Support

Eg: says:

"You can adjust the display’s brightness manually or automatically.

Use the brightness function keys

If the screen seems too light or too dark, you can adjust your display’s brightness.

• On your Mac, press  or  (or use the Control Strip).

Automatically adjust brightness

1. If your Mac has an ambient light sensor, choose Apple menu  > System Settings, then click Displays (square blue brightness icon)in the sidebar. (You may need to scroll down.)
2. Turn on “Automatically adjust brightness”.

If you don’t see the “Automatically adjust brightness” option, you can manually adjust the brightness.

Turning off auto-brightness may affect battery life, energy consumption and long-term display performance.

Manually adjust brightness

1. On your Mac, choose Apple menu (black Apple icon) > System Settings, then click Displays (square blue icon) in the sidebar. (You may need to scroll down.)
2. Drag the Brightness slider to adjust the brightness of your display.

Depending on the type of display connected to your Mac, you may also see a Contrast slider that you can use to adjust the display’s contrast.

If your display is slow to reach full brightness

If your Mac display is slow to reach full brightness, try these solutions.

• Give the display time to warm up.
• Make sure the display brightness is not turned off. Press (white brightness icon) to check or adjust the level of brightness.
• Turn on the ambient light sensor so your Mac can automatically adjust brightness based on current ambient lighting conditions. Choose Apple menu (black apple icon) > System Settings, click Displays (square blue brightness icon) in the sidebar (you may need to scroll down), then turn on “Automatically adjust brightness” or “Ambient light compensation”.
• These options appear only if your Mac has an ambient light sensor.

For specific information about the brightness of your display, check the documentation that came with your display."

OK. Thank you kindly for checking, and for your reply.

It is early days for this major upgrade:

You may want to send feedback to reach those who work on the software behind-the-scenes at Apple. If others are reporting a similar issue, we may see an update that addresses it.

Web-form for feedback: Feedback - Safari - Apple

Not it. It only happens when opening Safari. This was not a problem before the update.