It does not always happen. However 70% of the time the power cord trick works. Abouth third of that on the first attempt, otherwise requires several. If the kworker refuses to calm, reboot and repeat.
1. Start the System Monitor (easiest way to track the CPU usage - Core 1 in this case) 2. Remove the power cord - takes a second for the System Monitor to show teh CPU usage go dow. - sometimes it goes up almost immediately, - sometimes it gives you a 2-3 second break and then goes up back o its 75% - sometimes (you win) it stays down. 3. Insert the power cord - it will do the same thing. It probably doesn't matter whether you are unplugging or restoring teh AC power - it confuses the heck out of ACPI anyway. Keep messing with the power cord. Sometimes I suspect something else keeps kworker occupied, so wait a couple of minutes after reboot or unsuccessful power cord tricks. Sometimes (rarely) it will even go down on its own. My observations were from 2 to 5 minutes. Reboot after 5-6 unsuccessful attempts. Note: this only works with clean (default) grub config and when the Core 1 consumption is around 75-80%. If it is 100%: upon wake-up from resume or because you messed with pci=noacpi or acpi=noirq in teh grub config, the power cord is not going to calm the kworker though you might see the temporary: 1-2 second breaks in the System Monitor graph. I also think alternating kernel versions on boot doesn't do anythng. It is just rebooting. Post your observations. -- 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
