MacBook M1 Pro or Max Auto Power-On When Connected to USB-C Monitors

MacBook M1 Pro or Max may Power On automatically after shutting down or hibernating when connected to a monitor using a USB-C cable.

(Figure 1 - MacBook connected to a USB-C Monitor)

Affected Systems:

• Dell 34 Curved USB-C Hub Monitor - P3424WE
• Dell UltraSharp 38 Curved USB-C Hub Monitor - U3824DW
• Dell UltraSharp 49 Curved USB-C Hub Monitor - U4924DW
• MacBook M1 Max with OS version: 14.5
• MacBook M1 Pro with OS version: 14.4.1

Steps to Reproduce:

1. Connect the MacBook M1 Pro or Max and monitor using a USB-C cable.
2. Make the system enter shutdown or sleep mode and wait for the monitor to go to standby mode.
3. The MacBook M1 Pro or Max will power on(/wake up) from sleep mode automatically

Apple MacBook M1 Pro or Max behaves differently from other Apple products (Mac Intel chipset).

MacBook M1 Pro or Max shut down status:

1. Enter the monitor’s OSD menu and set USB-C Changing 90 W to Off in Off Mode, which is the same as the default setting.
   Personalize → USB-C Charging 90 W → Off in Off Mode

   

   (Figure 2 - Monitor OSD Menu)

2. When the MacBook M1 Pro or Max is going to shut down.

   

   (Figure 3 - MacBook M1 Pro or Max Shut Down)

3. Press the Power Button on the back side of the monitor to turn off the monitor.

   

   (Figure 4 - Power Button)

4. MacBook M1 Pro or Max will not power on (/wake up) automatically.

MacBook M1 Pro or Max hibernate status:

1. Open the Mac terminal window  
2. Type in: sudo pmset -a hibernatemode 3
3. Select Sleep Mode to make the MacBook M1 Pro or Max enter sleep status.

   

   (Figure 5 - Sleep Mode)

4. The MacBook M1 Pro or Max stays in sleep status, and it does not wake up automatically until the user wakes up.