Why Some USB Ports Are Yellow (And Less Common Than Others)
Yellow USB-A ports usually mean Always On charging, but the particulars are up to the manufacturer.
A yellow USB port usually marks an "Always On" port, meaning it will continue to charge your device once you turn the computer off. It's one of several colors on USB-A ports, but none are an industry standard.
For example, the USB Implementers Forum (USB-IF) recommends one insert color, a specific blue, to help people tell the difference between USB 2.0 and USB 3.0 ports. However, this is just a suggestion, not a mandate. Every other color, yellow included, is a convention manufacturers can follow or not.
Lenovo, for example, jumps around with colors. The older IdeaPad Y400 and Y500 feature yellow USB-A ports that are specifically for Always On charging. Later Lenovo models dropped the yellow entirely and replaced it with battery icons.
Always On still needs power, and sometimes a setting
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