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My computer is currently doing something like 30k+ interrupts per second. This causes battery issues as well as the CPU being always stuck at the highest speed, making it very hot (overheating.. 75C at IDLE)

Powertop info:

99.4% (32052.4) [acpi] <interrupt>
0.3% (115.9) [iwlagn] <interrupt>

Just to clarify this started suddenly a couple of days ago. It didn't have this issue before (though I had a tonne of headaches with Linux on my computer in general..)

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What is the laptop's make and model? –  Oli Aug 8 '11 at 14:06
    
Lenovo IdeaPad Y460. The most ubuntu-incompatible laptop of all time. (Issue after issue) –  Pwnna Aug 8 '11 at 14:07
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3 Answers

up vote 2 down vote accepted

The reason apparently lies with the BIOS. Something has changed the BIOS... which caused this problem. Fixed via a reflash of the latest BIOS image from the Lenovo's support site under Windows.

I noticed when Windows had the same issue of interrupts taking a lot of CPU, which happened to originate from ACPI.sys

The only thing I installed prior to this happening was the fglrx 11.7 update... IDK if this had anything to do with it, but it's the only thing that I've installed.

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Try unloading the ibm_acpi module (Source)

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Don't have that module. –  Pwnna Aug 8 '11 at 14:00
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You could try Linux boot params acpi=noirq, sometimes I find I have the same problem I don't know why, when I added this params, no more acpi interrupts.

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