Why are USB devices still powered on after you turn off the PC?

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Why are USB devices still powered on after you turn off the PC?

Why are USB devices still powered on after you turn off the PC?

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MikeDragon159
Senior Member

661

04-08-2018, 05:31 AM

#1

Hello, I'm using a Gigabyte Z390 Xtreme (rev. 1.0). I observed that after turning off the PC, certain USB devices still stayed powered on through the motherboard's USB ports. Why is this happening? Is it normal? Are there any methods to disable them without unplugging the cables?

M

MikeDragon159

04-08-2018, 05:31 AM #1

Hello, I'm using a Gigabyte Z390 Xtreme (rev. 1.0). I observed that after turning off the PC, certain USB devices still stayed powered on through the motherboard's USB ports. Why is this happening? Is it normal? Are there any methods to disable them without unplugging the cables?

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Apel29
Member

192

04-08-2018, 07:37 AM

#2

Normal.

A

Apel29

04-08-2018, 07:37 AM #2

Normal.

C

cjdeibert
Member

139

04-08-2018, 08:14 AM

#3

make sure it is typically a BIOS configuration. check the options for "USB power after shutdown" or "ERp Ready" and adjust them to "disabled" or "S5 mode".

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cjdeibert

04-08-2018, 08:14 AM #3

make sure it is typically a BIOS configuration. check the options for "USB power after shutdown" or "ERp Ready" and adjust them to "disabled" or "S5 mode".

D

Domencho
Member

71

04-11-2018, 08:22 PM

#4

You may notice that certain USB ports fail to deliver +5V when the computer is in standby mode. Consider relocating the device to a different port if feasible. Besides trying BIOS settings to disable this function, another approach is to cut off the power supply to the PC. This is straightforward if you have switched mains outlets, though it becomes more challenging with unswitched sockets.

D

Domencho

04-11-2018, 08:22 PM #4

You may notice that certain USB ports fail to deliver +5V when the computer is in standby mode. Consider relocating the device to a different port if feasible. Besides trying BIOS settings to disable this function, another approach is to cut off the power supply to the PC. This is straightforward if you have switched mains outlets, though it becomes more challenging with unswitched sockets.

S

Scissors_Luv
Member

52

04-11-2018, 08:42 PM

#5

Yes, it's completely acceptable.
Since the energy usage is quite minimal, I think it's best to let it stand.

S

Scissors_Luv

04-11-2018, 08:42 PM #5

Yes, it's completely acceptable.
Since the energy usage is quite minimal, I think it's best to let it stand.