Yep, same for me. It's an ACPI problem but unlike Alex, removing the power cord doesn't seem to fix it. I am running with "acpi=noirq" as a workaround but this pretty much disables all power management for me.
Lenovo Y560p Intel i7 with ATI video. Broadcom NIC. Kubuntu 12.10 - Kernel 3.5.0-19 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/887793 Title: Kworker constantly taking about 100% CPU To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/887793/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
