Vista-64bit:
Method does not work on Vista (I tried on Vista 64-bit) - you'll get a message that says "Unable to access thread: The system cannot find the file specified." Running process explorer as admin makes no difference.
1. Download and run DPC latency checker:
http://www.thesycon.de/deu/latency_check.shtml
2. Download and run Process Explorer
http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx
3. In process explorer, double click System.
4. Go to Threads
5. Select acpi.sys
6. click suspend
7. You'll notice that the red spikes are gone.
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I would suggest re-enabling this before shutting down...
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