setpci latency_timeout gigabyte board

[jdgill0]

I have a GIGABYTE GA-8IPE1000 Pro2 motherboard. I need/want to change the latency timeout for my SATA controller. The command to do this is setpci -s xx:xx:xx latency_timeout=n, where n is a hex number. It seems the motherboard prevents the setpci command from actually changing the timeout from its default value of zero.

Does anyone know if it's possible to override the motherboard somehow? I have searched through the BIOS setup and can find nothing to allow changing latency settings of any kind. I can change the latency for cards installed in PCI slots, but not for onboard hardware such as sound, IDE controller, SATA controller, etc.

Thanks.
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