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While I also noticed my webcam showing up with 3W in powertop and disabling the uvcvideo module removed that entry, it doesn’t affect the reported battery discharge rate at all.
I can see the files being opened with lsof and not so with the workaround. But again the discharge rate doesn’t change at all …
To me it seems the power consumption is misreported.
No wonder. That file is super slow to transfer for some reason. but wait till you get to /dev/urandom. That file hat TBs to transfer at whatever pipe you can throw at it…