I have tried the test patch provided by Mathias Nyman in http://linux- kernel.2935.n7.nabble.com/TESTPATCH-v2-xhci-fix-usb2-resume-timing-and- races-tc1250796.html#a1256745 and rebuilt a Wily 4.2 kernel and that has prevented High CPU usage of kworker/ksoftirqd under all the circumstances I have tried. Note this is marked as a TESTPATCH and Mathias Nyman mentions his intention is to " do some minor cleanups and add it to the queue ". At best it will be in the 4.4 kernel and then available for backports but it good to know that there is a solution in hand.
@acelan Is there any way for you to also push the Mathias Nyman patch into the ubuntu kernel, assuming it also solves your original problem. Then normal users can just use an updated ubuntu kernel to get rid of this issue. As it is a timing and race problem it may well turn out to have a much wider impact than current reports show, in particular as it seems to affect Skylake machines. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1488426 Title: High CPU usage of kworker/ksoftirqd Status in HWE Next: New Status in linux package in Ubuntu: In Progress Bug description: kworker consuming 71.5% cpu resource ksoftirqd consuming 28.9% cpu resource It leads to power consumption issue and sometimes leads to BT does not work. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1488426/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp