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 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to upower in Ubuntu. https://bugs.launchpad.net/bugs/876279 Title: Upowerd excessive CPU usage Status in upower package in Ubuntu: Confirmed Bug description: Fresh installation of Oneiric on Activo A-1100 (Atom N450-based) netbook. Top reports CPU usage fluctuating between 60% and 100%, averaging around 80%. Machine still marginally usable, due to having a second core. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: upower 0.9.13-1 ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4 Uname: Linux 3.0.0-12-generic i686 NonfreeKernelModules: wl ApportVersion: 1.23-0ubuntu3 Architecture: i386 Date: Mon Oct 17 18:59:31 2011 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012) ProcEnviron: LANGUAGE=en_AU:en PATH=(custom, no user) LANG=en_AU.UTF-8 SHELL=/bin/bash SourcePackage: upower UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/upower/+bug/876279/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
