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
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https://bugs.launchpad.net/bugs/1488426
Title:
High CPU usage of kworker/ksoftirqd
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