About This File
This is a mald0n patched DSDT for a Dell Studio Desktop Slim 540s. Place the file in your /Extra folder then capitalize it (DSDT.aml).
This DSDT is based on the latest bios as of this writing (bios 1.1.3).
Enable P states and C states in com.apple.boot.plist. AFTER you enable p and c states. You can delete the NullcpuManagement kext. Shutdown and restart work. Sleep does NOT work.