Is there a plasmoid that displays the instant power consumption when on AC

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1

There is a Power plasmoid, but it only works when running on the battery…

2

I think this is a hardware limitation. This same behavior happens with “powertop”, powertop can only show you real time power stats if you unplug the AC brick on the laptop.

3

I think you are right, unfortunately.

4

While it’s an older question, the info shared here on a Stack Exchange post is still relevant here, I think: