my laptop's status is still the same CPU is still at 90% on one core (as seen in system monitor) when it should be idle even when i plug in a usb device. The only thing that helps is the webcam being active :( The core that goes up to 90% usage is random, it is not the same one every time i login
flori@flori-Inspiron-5555:~$ uname -a Linux flori-Inspiron-5555 4.2.0-23-generic #28-Ubuntu SMP Sun Dec 27 17:47:31 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux flori@flori-Inspiron-5555:~$ lsusb -t /: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 1: Dev 4, If 0, Class=Wireless, Driver=btusb, 12M |__ Port 1: Dev 4, If 1, Class=Wireless, Driver=btusb, 12M /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=rtsx_usb, 480M |__ Port 2: Dev 4, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 2: Dev 4, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 2: Dev 4, If 2, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 4: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M |__ Port 2: Dev 2, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 2: Dev 2, If 1, Class=Video, Driver=uvcvideo, 480M -- 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