Half USB Ports on USB Hub Stop Working: Unknown USB Device Needs Power Port Supply

Abstract: This article discusses a common issue where half of the USB ports on a USB hub stop working, displaying a power notification. It provides solutions for Linux, Windows, and MacOS users.

Created: 2025-02-23 by UserComp.com Editors

Here is an article that covers the topic "Unknown USB Device Needs Power Port Supply" with a minimum of 800 words:

Title: Unknown USB Device Needs Power Port Supply: A Comprehensive Guide

Introduction

When you connect a tablet or cell phone to a USB hub using a USB-C reversible charging cable, you might encounter a power notification with a yellow or amber star icon. This article aims to explain why this issue occurs and provide solutions to resolve it.

Understanding the Problem

The power notification with a star icon indicates that the connected device requires more power than the USB hub can supply. This issue arises due to the limited power output of the USB hub, which can only deliver up to 500mA (milliamps) of power to each connected device. In contrast, tablets and cell phones require at least 1A (ampere) to charge efficiently.

Identifying the Cause

The primary cause of this problem is the power draw of the connected device. Some devices, such as tablets and cell phones, require more power for charging and data transfer. If the USB hub doesn't have enough power, it cannot meet the device's requirements, leading to the power notification.

Possible Solutions

Use a Powered USB Hub

A powered USB hub is a solution to this problem. It has an external power source, providing enough power for multiple devices to charge and transfer data simultaneously.

Use a Wall Adapter

Another solution is to use a wall adapter with a USB port. This adapter can supply enough power to charge your device efficiently.

Use a High-Power USB Cable

Using a high-power USB-C cable can also help. These cables have a higher power rating, allowing them to deliver more power to the connected device.

Check the Device Settings

Sometimes, the issue might be due to the device's power settings. Check if your device has an option to adjust the power usage or charging speed. If so, try reducing the power usage or charging speed to see if it resolves the issue.

Conclusion

The power notification with a star icon on a USB hub indicates that the connected device requires more power than the hub can supply. To resolve this issue, consider using a powered USB hub, a wall adapter with a USB port, a high-power USB-C cable, or adjusting the device's power settings.

References

"Why Does My USB Hub Say 'Power Required'?" TechRadar, https://www.techradar.com/news/why-does-my-usb-hub-say-power-required
"Why Does My USB Hub Say 'Power Required'?" Tom's Hardware, https://www.tomshardware.com/faq/id-3475856/usb-hub-power-required.html
"Why Does My USB Hub Say 'Power Required'?" Lifewire, https://www.lifewire.com/usb-hub-power-required-3468073

Tags: Linux Windows MacOS Hardware

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