All of the USB ports on a DV9000 have USB2 hardware. Depending on how old your machine is, what software updates have been applied, devices you have attached (both currently and while you applied software updates) you might only have the original USB software drivers.
Find a geek friend that has a USB version detector (looks a lot like a USB flash drive, but has one or more LEDs on it) if you are really concerned. Another possible answer is to take a device that requires USB2 to function and see which port(s) it works on... My guess would be that all of the ports will function properly as USB2, especially if you have a current Windows Service Pack.
-PatP