Comment 18 for bug 876279

After upgrading from Ubuntu 14.04 LTS to 16.04 LTS (xenial) I'm affected by this bug, too. If I connect an Apple iPad Mini using USB cable (with the intent to charge the tablet only) I get excessive CPU usage. Process /usr/lib/upower/upowerd owned by root seems to be doing nothing but eating CPU until I manually kill it or disconnect the iPad.

Comment #10 claims that this might be a kernel bug but the referenced source (http://web.archiveorange.com/archive/v/7azSgetwkAZWsEpXKXWy) is no longer available.

$ apt-cache policy upower
upower:
  Installed: 0.99.4-2ubuntu0.2
  Candidate: 0.99.4-2ubuntu0.2
  Version table:
 *** 0.99.4-2ubuntu0.2 500
        500 http://fi.archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.99.4-2 500
        500 http://fi.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

$ uname -a
Linux semyol-329-b 4.4.0-24-lowlatency #43-Ubuntu SMP PREEMPT Wed Jun 8 20:27:10 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux