New answers tagged power-supply
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Explanation
The IC / microcontroller in your VGA adapter couldn't simultaneously convert the signal from USB to VGA (display) and providing a USB hub.
There is plenty of reason for that part :
The signal of USB data and VGA signal is different you can only choose either one of them.
The USB port only for the external device when the VGA is OFF, meaning the ...
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power-supply × 84usb × 13
pc × 11
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motherboard × 8
power × 8
hub × 7
desktop × 6
power-bank × 6
power-control × 6
laptop × 5
processor × 4
smartphones × 4
ups × 4
gaming × 3
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monitors × 3
hard-disk × 2
wireless × 2
tablet × 2
case × 2
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portable × 2
quiet-computing × 2
power-converter × 2