Monday, March 27, 2023

How to charge gadgets via USB when the computer is turned off


To charge mobile gadgets via USB, you can use a laptop or personal computer. However, not many users know that it is possible to charge devices even with the PC turned off, as long as it is still connected to the outlet. After all, the power supply has a standby +5 volt line that can power the USB ports on the motherboard.

First you need to make sure that such a function is supported by your motherboard . First of all, study the description on the official website of the developers.

On motherboards from Gigabyte, you should look for the ON / OFF Charge function . In products from MSI, this feature is called Super Charger or i-Charger . The main condition is that the function must work not only in the S3 and S4 states (power saving modes), but also in S5 (the computer is turned off). Please note that only certain USB ports may support charging while the computer is off.

In the manual that comes with the motherboard, you need to look for the line charge function under S3, S4, S5 mode or similar.

If no information can be found, please contact the brand representatives with a question about the ability to charge USB devices when the PC is turned off.

Jumper on motherboard
To activate the power supply to the USB ports on some models of boards, it will be enough to move a small jumper to another position. On the motherboard, you need to find connectors, which are designated as USBPW1-4 or USBPW5-10 . By the numbers, you can understand which specific USB ports this terminal block is responsible for.

From the factory, the jumper is in position 1-2, which indicates a value of 5V. You need to move it to position 2-3 to put the motherboard into 5V SB (Stand By) mode. In this case, standby 5 volts from the power supply will be used .

The function is relevant for turning on the power of the computer from the keyboard, from the modem or by a signal from the network card, and also supplies voltage to the USB even when the computer is turned off.

Changing BIOS settings
If moving the jumper does not work or it is not on your motherboard, then you need to look into the BIOS settings.

You can enter this system menu when you turn on the computer before loading the operating system itself. To do this, constantly press the F2 or Del key. It is they who in most computers are responsible for the transition to the BIOS. Asus laptops may use the F9 button, while Acer and Lenovo products will require you to press F1 or F2 depending on the model.

In older computers and laptops, these are the versions of the system menu. Most of the points and sections of AMI and AWARD are the same, so we will consider them in one block. Once you have entered the main BIOS menu, follow these steps:

  1. Use the keys on your keyboard to navigate to the Integrated Peripherals section.
  2. The USB Controller and USB Device Legacy Support items should be in the Enabled state.
  3. Exit to the main menu using the Escape key. Go to the Power Management Setup section.
  4. Verify that the ACPI Functions item is in the Enabled state. Go to the Wake Up Event subsection.
  5. Enable the Resume From S3 by USB Device item by setting the Enabled state.
  6. It remains only to save the changes using F10 and restart the computer.

Depending on the specific version, menu items may differ in name. If the motherboard supports ErP / EuP , then be sure to disable this mode, otherwise power will not be supplied to the USB ports.

ErP includes increased energy savings, due to which voltage is not supplied to USB ports and most other components of the motherboard.

When ErP is activated, the computer will consume no more than 1 W


The latest “motherboards” already have an advanced version of the BIOS with a lot of additional settings and a more interactive menu. To activate the power on the USB ports when the computer is turned off, you need to follow these steps:

  1. It is recommended to enable the English language in the UEFI BIOS, since the translation into Russian in some paragraphs may not be performed correctly. To do this, go to Advanced Mode (F7) and select English from the System Language menu.
  2. Then, on the Advanced tab, go to the Onboard Devices Configuration settings block.
  3. Find among the items the line USB Battery Charging Support or Charging USB Devices in State S5. It is necessary to transfer the parameter to the Enable value. Specifically for this motherboard, charging will only be available via USB 3.1. It remains only to save the changes.

“Important. Don’t forget to turn off ErP Ready. It is located in the APM Configuration section.

On MSI motherboards, go to the Advanced section of the main menu. Next, the Wake Up Event Setup item is selected.

It remains only to transfer the Resume from S3-S5 by USB Device parameter to the Enabled state.

After these manipulations in the BIOS, you can try to charge your mobile phone or tablet from USB when the PC is turned off. Please note that you need to connect the gadget to the ports directly on the motherboard.


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