How Can I Determine Which USB Device Is Causing My System To Wake From Sleep?

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Introduction

Are you tired of your system waking up from sleep unexpectedly? If you're experiencing this issue on your 2019 iMac running macOS Ventura, you're not alone. Many users have reported similar problems, and it's often caused by a USB device that's not properly configured or is malfunctioning. In this article, we'll guide you through the process of identifying the culprit USB device that's causing your system to wake from sleep.

Understanding the Problem

Each time your system wakes up from sleep, various lights blink on, and hard drives spin up. This can be frustrating, especially if you're trying to conserve energy or work in a quiet environment. The issue is often caused by a USB device that's not properly configured or is malfunctioning. This can include devices such as:

  • External hard drives
  • USB flash drives
  • Printers
  • Scanners
  • Webcams
  • Mice and keyboards

Using pmset to Identify the Problematic Device

To identify the problematic device, you can use the pmset command in the Terminal app. pmset is a command-line utility that allows you to manage power settings on your Mac. Here's how to use it:

  1. Open the Terminal app on your Mac.
  2. Type the following command and press Enter: pmset -g log
  3. This will display a log of all the events that have occurred on your system, including wake events.
  4. Look for the wake events that occurred while your system was in sleep mode.
  5. Check the device that was connected to the system at the time of the wake event.

Using system_profiler to Identify the Problematic Device

Another way to identify the problematic device is to use the system_profiler command. This command will display a detailed report of your system's hardware and software configuration.

  1. Open the Terminal app on your Mac.
  2. Type the following command and press Enter: system_profiler SPUSBDataType
  3. This will display a list of all the USB devices connected to your system.
  4. Look for the device that's causing your system to wake from sleep.
  5. Check the device's properties, such as its vendor ID, product ID, and serial number.

Disabling Wake on USB Devices

Once you've identified the problematic device, you can disable wake on USB devices using the pmset command. Here's how to do it:

  1. Open the Terminal app on your Mac.
  2. Type the following command and press Enter: pmset -a powernap 0
  3. This will disable wake on USB devices.
  4. To re-enable wake on USB devices, type the following command and press Enter: pmset -a powernap 1

Disabling Wake on Specific USB Devices

If you want to disable wake on a specific USB device, you can use the pmset command with the -a option. Here's how to do it:

  1. Open the Terminal app on your Mac.
  2. Type the following command and press Enter: pmset -a powernap 0 -a "device-id <device-id>"
  3. Replace <device-id> with the device ID of the USB device you want to disable wake on.
  4. To re-enable wake on the specific USB device, type the following command and press Enter: pmset -a powernap 1 -a "device-id <device-id>"

Conclusion

Identifying the problematic USB device that's causing your system to wake from sleep can be a challenging task. However, by using the pmset and system_profiler commands, you can identify the device and disable wake on it. Remember to disable wake on specific USB devices using the pmset command with the -a option. By following these steps, you can finally get your system to stay asleep when you put it to sleep.

Additional Tips

  • Make sure to update your system to the latest version of macOS.
  • Disable wake on USB devices for all devices, not just the specific device that's causing the problem.
  • Use a USB hub to connect your devices, as this can help to reduce the number of wake events.
  • Consider using a third-party utility to manage power settings on your Mac.

Troubleshooting Tips

  • If you're still experiencing issues after disabling wake on USB devices, try resetting the System Management Controller (SMC) and the Power Management Unit (PMU).
  • If you're using a USB device that's not properly configured, try updating the device's firmware or drivers.
  • If you're experiencing issues with a specific USB device, try replacing the device or using a different device.

Frequently Asked Questions

  • Q: How do I disable wake on USB devices? A: You can disable wake on USB devices using the pmset command with the -a option.
  • Q: How do I identify the problematic USB device? A: You can use the pmset and system_profiler commands to identify the problematic USB device.
  • Q: How do I disable wake on a specific USB device? A: You can use the pmset command with the -a option to disable wake on a specific USB device.

References

  • Apple Support: "About power management on your Mac"
  • Apple Support: "About wake events on your Mac"
  • Apple Support: "About the System Management Controller (SMC) and the Power Management Unit (PMU)"

Q: What is wake on USB devices, and why is it a problem?

A: Wake on USB devices is a feature that allows your Mac to wake up from sleep when a USB device is connected or disconnected. While this feature can be useful in certain situations, it can also cause problems if a device is not properly configured or is malfunctioning. This can lead to your Mac waking up from sleep unexpectedly, which can be frustrating and waste energy.

Q: How do I know if wake on USB devices is enabled on my Mac?

A: You can check if wake on USB devices is enabled on your Mac by using the pmset command in the Terminal app. Type the following command and press Enter: pmset -g log. This will display a log of all the events that have occurred on your Mac, including wake events. Look for the wake events that occurred while your system was in sleep mode.

Q: How do I disable wake on USB devices on my Mac?

A: You can disable wake on USB devices on your Mac by using the pmset command with the -a option. Type the following command and press Enter: pmset -a powernap 0. This will disable wake on USB devices. To re-enable wake on USB devices, type the following command and press Enter: pmset -a powernap 1.

Q: How do I identify the problematic USB device that's causing my Mac to wake up from sleep?

A: You can use the pmset and system_profiler commands to identify the problematic USB device. Type the following command and press Enter: system_profiler SPUSBDataType. This will display a list of all the USB devices connected to your system. Look for the device that's causing your Mac to wake up from sleep.

Q: How do I disable wake on a specific USB device?

A: You can use the pmset command with the -a option to disable wake on a specific USB device. Type the following command and press Enter: pmset -a powernap 0 -a "device-id <device-id>". Replace <device-id> with the device ID of the USB device you want to disable wake on.

Q: What are some common USB devices that can cause wake on USB devices issues?

A: Some common USB devices that can cause wake on USB devices issues include:

  • External hard drives
  • USB flash drives
  • Printers
  • Scanners
  • Webcams
  • Mice and keyboards

Q: Can I use a USB hub to reduce the number of wake events?

A: Yes, you can use a USB hub to reduce the number of wake events. By connecting your devices to a USB hub, you can reduce the number of wake events and make it easier to identify the problematic device.

Q: Can I use a third-party utility to manage power settings on my Mac?

A: Yes, you can use a third-party utility to manage power settings on your Mac. Some popular third-party utilities include:

  • Coconut Battery
  • PowerTop
  • WakeMe

Q: What are some troubleshooting tips for wake on USB devices issues?

A: Some troubleshooting tips for wake on USB devices issues include:

  • Resetting the System Management Controller (SMC) and the Power Unit (PMU)
  • Updating the device's firmware or drivers
  • Replacing the device or using a different device

Q: Can I use the pmset command to disable wake on USB devices for all devices?

A: Yes, you can use the pmset command to disable wake on USB devices for all devices. Type the following command and press Enter: pmset -a powernap 0. This will disable wake on USB devices for all devices.

Q: Can I use the pmset command to enable wake on USB devices for all devices?

A: Yes, you can use the pmset command to enable wake on USB devices for all devices. Type the following command and press Enter: pmset -a powernap 1. This will enable wake on USB devices for all devices.

Q: What are some additional tips for managing wake on USB devices?

A: Some additional tips for managing wake on USB devices include:

  • Making sure to update your system to the latest version of macOS
  • Disabling wake on USB devices for all devices, not just the specific device that's causing the problem
  • Using a USB hub to connect your devices, as this can help to reduce the number of wake events
  • Considering using a third-party utility to manage power settings on your Mac.