If it doesn't a BIOS update should fix it hopefully.
Using the latest from MSI (1B).
An old unrelated thread mentions being able to set the "S3 Wake Up By PS/2 Keyboard" to "S3/S4/S5" (S5 being powered off state).
The last few BIOS's that support AMD64 X2 only have an "Enabled/Disabled" option. Even when using the Shft-F2+Alt F3 to show "hidden" features in BIOS, it doesn't have it.
Looks like older BIOS's have it, but need one that supports AMD64 X2 dual core.