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First thing, disable the USB keyboard, not necessary to run USB mouse\keyboard and actually causes more problems.

See if that alone cures your problem, you have full acpi support, otherwise would not be listed.

Being lazy here, try the MCE standby tool found here

http://www.xs4all.nl/~hveijk/mst/indexe.htm

And if all works well then, you just need to find out which setting the tool does, that makes it AOK.