this is a bug in powertop logic.
ubuntu kernel has usb autosuspend enabled by default, so you do not need any
workarounds given here.
** Changed in: powertop (Ubuntu)
Status: New => Incomplete
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Powertop suggest to add usbcore.autosuspend=1 to grub's kernel line, doesn't
work
https://bugs.launchpad.net/bugs/136549
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