> The problem is that you can’t use the 16” with an external display and the lid open without the fans spinning at full speed.
I had the same problem, when connected to a USB-C monitor I wanted to use the keyboard, but not the built in monitor. Even with the display backlight off the fan would still run. After a lot of searching I found that you can disable the built in monitor by:
- Booting into recovery mode
- Opening Terminal
- Entering `sudo nvram boot-args="niog=1"`
- Restarting
- Close the clamshell
- Plug in the external monitor
- Open the monitor
I had the same problem, when connected to a USB-C monitor I wanted to use the keyboard, but not the built in monitor. Even with the display backlight off the fan would still run. After a lot of searching I found that you can disable the built in monitor by:
- Booting into recovery mode - Opening Terminal - Entering `sudo nvram boot-args="niog=1"` - Restarting - Close the clamshell - Plug in the external monitor - Open the monitor
I hope that helps.