upowerd is consuming nearly 100% of CPU.

I am currently affected by this issue on both a Lenovo Thinkpad E520 and on a desktop PC running Core i7 and Asus Z170a motherboard. Both run Kubuntu 15.10. However, I have found reports of this problem on several different distros (from Fedora to Arch to Ubuntu) going back several years.

I found these bug reports, but I don't find any workaround or solution:

FS#40444 : [upower] upowerd 0.99.0-2 eats all resources https://bugs.archlinux.org/task/40444

Bug #861642 “upowerd uses 100% cpu till killed” : Bugs : upower package : Ubuntu https://bugs.launchpad.net/ubuntu/+source/upower/+bug/861642

Bug #876279 “Upowerd excessive CPU usage” : Bugs : upower package : Ubuntu https://bugs.launchpad.net/ubuntu/+source/upower/+bug/876279


After discovering this page I did some experimentation; connecting and disconnecting my iPhone 4 (ios 7.1.2) with up-to-date Ubuntu 16.10 using Unity running on a MacBookPro7,1

I found that just confirming Trust on the iPhone had no effect; { in fact I am asked repetitively to allow trust on this system unless I indicate 'Don't Trust', but that is another matter }

I also found that usbmuxd is playing a big part in this problem, so forcing usbmuxd to exit is a quick and dirty fix.

/usr/sbin/usbmuxd -X

After NOT Trusting and running the command I can charge the phone, and connect to it as a wireless or bluetooth hotspot without the cpu time consumption. { the phone also stops asking whether to trust the computer or not, and usbmuxd stops restarting }


Do you have an iphone connected to the computer? This happens to me whenever I connect my iphone to it.

Linux arjun-thinkpad 4.4.7-1-lts #1 SMP Thu Apr 14 17:26:39 CEST 2016 x86_64 GNU/Linux

  • Indeed, this is the case for me too - how do I fix it though, so that I can leave my iPhone connected ? – JonasCz - Reinstate Monica Aug 12 '16 at 12:52
  • @JonasCz I did a little digging, but couldn't find a solution. It's not a huge deal for me, so I haven't bothered to pursue it. If you do figure it out, could you please post here? – user128063 Aug 22 '16 at 7:39
  • Same thing here, can confirm. – Mikhail Kalashnikov Sep 15 '16 at 16:33
  • 5
    According to askubuntu.com/questions/818965/upowerd-hogging-cpu it helps to select "Trust this computer" when connecting the iPhone to the computer. This solves the problem for me. – user44400 Oct 12 '16 at 14:48
  • Here, I unplug my iPhone and save 10 %CPU – Nolwennig Jun 26 '19 at 1:53

I had this issue. It seems to be an issue if I boot up with the iPhone already plugged in. Instead,

unplug the iPhone and boot. After everything is up and running, plug the iPhone back in and "trust" and enter pass code. cpu usage should gradually drop.

just don't boot up with the iPhone plugged in and this should not be a problem. At least that is how it was for me.

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