Suspend and Hibernate not working - PCI interrupt

I'm fairly new to Ubuntu and have been running in dual boot mode for about 6 months now with 8.. I'm ready to make the leap away from Vista, but my only challenge at this point is getting Suspend and Hibernate to work. I've looked at many of the posts and most seem to deal with laptops and the closing of their cover. I have a desktop instead - a Systemax Venture from TigerDirect.

Description of what happens:

When initiating a Suspend, the screen goes black and then I get the message below and the system just hangs:

[1666.763438] ACPI: PCI interrupt for device 0000:03:00.0 disabled

The behavior is similar when initiating Hiberbate, just the message is slightly different (the first few numbers) and it hangs:

[689.923578] ACPI: PCI interrupt for device 0000:03:00.0 disabled

I've seen the frequent request for the graphics hardware that's installed. Below is the result of running $ lspci | grep VGA:

01:00.0 VGA compatible controller: nVidia Corporation G71 [GeForce 7950 GT] (rev a1)

Let me know what other information/commands/outputs I can provide. I'd really like to make the switch once and for all but would first like to resolve the Suspend/Hibernate.

Thanks in advance,

Nathan