Just a quick update -- on those C & P-states, unless you're using a T7300, those may (probably) not work for you. You'll need the FID/VID values for your specific processor, and then recompile the dsdt accordingly.

Best of luck.

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Dell Latitude D830
CPU Intel C2D T7300,2GHz,4MB,800MHz [+p/c states,DSDT]
RAM 4GB DDR2,PC5300
Graphics Intel x3100 [DSDT]
Audio Sigmatel 9205 [legacySTAC9205]
Wired Broadcom 5711 -64 [AppleBCM5751]
Wireless Broadcom 4311,4328, Flashed Apple IDs
Bluetooth Dell 350
HDD SATA 500GB,16MB [ATA,DSDT]
Display 15.4" UXGA,1920x1200x32,Display Sleep [DSDT]
Halt/Restart Flawless. [OpenHaltRestart]
Sleep Flawless. Power Button,Clamshell [DSDT]
Other Brightness slider, Perfect Energy Saver