Same problem on Lenovo Y560p.

    grep enabled /sys/firmware/acpi/interrupts/*

indicates problem is gpe17 and gpe18.

    echo disable > /sys/firmware/acpi/interrupts/gpe17
    echo disable > /sys/firmware/acpi/interrupts/gpe18

Disabling gpe18 works and alleviates some of the CPU load. Disabling
gpe17 alleviates the remainder of the CPU load *but* CPU load jumps back
up in less than a minute (often within 5 seconds). grep enabled
/sys/firmware/acpi/interrupts/* indicates that gpe17 is enabled! Disable
again, CPU load goes down, but gpe17 reenables shortly thereafter.

Adding the above commands to /etc/rc.local doesn't seem to work, or
maybe it does but only temporarily.

I know this thread goes back to 2011, but this problem only manifested a
month or two ago. Not sure what update triggered it (assuming it was
some update).

Running Linux Mint 13 with kernel 3.2.0-23-generic.

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https://bugs.launchpad.net/bugs/887793

Title:
  Kworker constantly taking about 100% CPU

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