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This question already has an answer here:

I want to know what kind of power supply I have and what wattage it has. I tried:

sudo dmidecode -t 39

but that didn't show any specs. What do I need to do? I am on Ubuntu 13.10

marked as duplicate by dessert, Eric Carvalho, user535733, Community Feb 27 '18 at 7:32

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You should open your case and read all the data you are interested in at the power supply only or at the laptop adapter because power supplies don't have signals(no data bus) to "tell" about themselves to the any device like mainboard.

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