I have a laptop that charges via USB-C (fifth generation Thinkpad X1 with Ubuntu) and it can be charged by connecting it to the USB-C port of my desktop. But I would like to know at which wattage it is charging.

Is there a command to display at which wattage a laptop is currently charging? This would also be helpful to compare different combinations of charging bricks and USB cables.

  • The easiest way is to add a hardware voltage/amp/watt measurement device between USB-C & device; they are very cheap; and will display a real/just measurement instead of a software based one if it is possible (I 'm not sure software measurement is possible on USB from the laptop)
    – francois P
    Nov 20, 2021 at 16:53
  • @francoisP"Between USB and device"? So would that be something that has two USB ports and I connect one to the laptop and the other to the charger? Won't that confuse the smart USB cables which negotiate voltage between device and charger?
    – user313032
    Nov 20, 2021 at 16:58
  • 1
    things like link depending on you needs of course
    – francois P
    Nov 20, 2021 at 17:13


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