Well, I know this sounds dirty, underhanded, and I'd be pissed if it happened to me, but.
Are you positive you have USB 2.0? A few companies.. aka.. DELL.. GATEWAY.. have been known, as approved by microsoft, to call USB 1.1 USB 2.0, as its supposed to alleviate customer confusion of having to many forms of usb...
More companies than just dell and gateway have and still do this.
So, basically.
Dude, your got screwed?
Other than that. Brand new dell.. redhat.. You probably havent enabled acpi features yet?
Go recompile the kernel for acpi and apm features with dell laptop support, and try again.
Or switch to Suse linux which has these features already compiled.