I found a workaround for Ubuntu 16.04 LTS:
(1) Open "Network connections" ("nm-connection-editor" from command line)
(2) Try to figure out which "Ethernet" connection is iPad
(3) Select the iPad and click "Edit"
(4) On "General" tab, uncheck "Automatically connect to this network when it is
available"
(5) On "IPv4 Settings" tab select "Method: Disabled"
(6) On "IPv6 Settings" tab select "Method: Ignore"
It seems that the issue is caused by iPad/iPhone pretending to offer
Ethernet connection and "upowerd" automatically trying to enable that
connection. This operation fails and "upowerd" is stupid enough to
repeat the process forever.
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https://bugs.launchpad.net/bugs/876279
Title:
Upowerd excessive CPU usage
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