MacBook Pro M2/M3 Pro – Internal Display Goes Black

Hello,

I’m facing a recurring issue with my MacBook Pro M3 Pro (2023) running macOS Sequoia 15.6.1.

During regular development work with a secondary (external) monitor connected, the internal display (main screen) suddenly goes dim or turns completely black.

Even after disconnecting the external monitor, the internal display stays black/dim and does not return to normal until I restart the Mac.

What I’ve tried so far:

• Resetting NVRAM/SMC
• Reinstalling macOS
• Updating to the latest macOS build

Unfortunately, the issue still persists.

What’s more concerning is that I’ve observed the same problem on multiple MacBook Pro devices in my office (both M2 Pro and M3 Pro models) — at least 4 devices so far. This makes it seem like a broader issue rather than a one-off hardware defect.

Details:

• Model: MacBook Pro M3 Pro (2023)
• macOS: Sequoia 15.6.1
• Setup: External monitor usually connected during work

I’ve attached an image of the issue for reference.

Has anyone else experienced this? Is Apple aware of this problem, and is there a known fix or workaround?

Thanks in advance.