I also have the same issue. By killing fwupd I was able to temporarily stop the CPU usage. Manually restarting does not cause CPU usage to spike up again. Attached is the output of fwupd after manually restarting with,
> sudo /usr/lib/x86_64-linux-gnu/fwupd/fwupd -v Here's my system info, > sudo dmidecode | grep 'System Information' --after-context=10 System Information Manufacturer: LENOVO Product Name: 20HRCTO1WW Version: ThinkPad X1 Carbon 5th Serial Number: PF0QD769 UUID: 5EE5824C-23BB-11B2-A85C-C97143E41984 Wake-up Type: Power Switch SKU Number: LENOVO_MT_20HR_BU_Think_FM_ThinkPad X1 Carbon 5th Family: ThinkPad X1 Carbon 5th ** Attachment added: "fwupd.log" https://bugs.launchpad.net/ubuntu/+source/appstream-glib/+bug/1707110/+attachment/4959436/+files/fwupd.log -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to appstream-glib in Ubuntu. https://bugs.launchpad.net/bugs/1707110 Title: fwupd is consuming 100% of CPU in an upto date Ubuntu 16.04 Status in appstream-glib package in Ubuntu: Confirmed Bug description: Even though this bug is reported [https://bugs.launchpad.net/ubuntu/+source/appstream- glib/+bug/1591868] and marked as fixed, I am having the same issue on a up to date Ubuntu 16.04 system (as you can see in the attachment). Rebooting doesn't fix the problem. Thanks. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/appstream-glib/+bug/1707110/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp