In win7 system, there is a USB selective suspension setting. If we do not change this setting, then it will make our USB interface still run for a period of time even if it is turned off, which will waste a lot of power. We can Turn it off in the power options and let’s take a look.
1. First click on the battery or power supply in the lower right corner and select "More power options"
2 , click "Change plan settings"
3, and then enter "Change advanced power settings"
4. For personal needs, just set the icon position to "Enabled".
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