kworker wakeup calls take 100% of CPU every ~1sec in Precise

Liviu Andronic landronimirc at
Thu Sep 6 05:38:28 UTC 2012

Dear all
Using 12.04 with kernel 3.2.0 and latest updates on a Lenovo T61.

I have this nasty problem where a stray process, kworker or watchdog,
takes 100% of CPU every ~1sec. This causes UI freezes and essentially
renders Ubuntu unusable. Apparently this is a known issue related to
ACPI interrupt calls, but obviously it hasn't been fixed yet in the

Do others experience the same issue? How do you deal with it? Regards

PS A potential solution is suggested here [1], but I still have to test it.

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