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D520 BIOS Settings


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Since I haven't seen any other threads for BIOS settings on the D520, I figured I'd go ahead and mark mine down as what works, and what shouldn't be tinkered with to get either Snow Leopard or Lion up and running.


These BIOS settings were taken straight from Dell Latitude D520 BIOS version A08.



-System Info

-Processor Info

-Memory Info

-Device Info

-Battery Info

-Battery Health


-Boot Sequence


None of these fields are configurable, except "Boot Sequence". As the Latitude D520 has a boot selection menu (F12 at BIOS screen), I do not recommend changing any of the "Boot Sequence" options. Make your boot selections in the boot selection menu.


Onboard Devices:

-Fast IR = Off

-Integrated NIC = Enabled w/PXE

-Internal Modem = Enabled

-External USB Ports = Enabled

-Parallel Port = ECP

-Serial Port = COM1

-PC Card and 1394 = Enabled (OS X will not boot without 1394 enabled!)



-Brightness = Any

-Brightness (AC) = Any

-LCD Panel Expansion = Enabled



-Admin Password = Not Set

-System Password = Must be set for sleep/hibernation to function!

-Internal HDD PW = Not Set

-Password Change = Permitted

-Password Bypass = Reboot/Resume bypass

-Wireless Hotkey Change = Denied (Not sure about this.)

-CPU XD Support = Enabled

-Computrace ® = Deactivate



-Multi Core Support = Enabled

-HDD Acoustic Mode = Performance

-SpeedStep Enable = Enabled


Power Management:

-Auto On Mode = Off

-Auto On Time = X:XX

-USB Wake Support = Off (OS X will kernel panic upon wakeup with this on!)

-Wake on LAN/WLAN = Off

-Serial ATA DIPM = Enabled 



-Load Defaults = Cancel (Use only if you muck up BIOS too bad!)

-Service Tag = Some random alpha-numeric tag Dell assigns your machine



-Dock Device Info = Only valid if you are using a Dell Dock

-Undocking Method = Hot Undock

-Universal Connect = Enabled


POST Behavior:

-Adapter Warnings = Enabled

-Fn Key Emulation = Scroll Lock

-Fast Boot = Enabled

-Keypad (Embedded) = Fn Key Only

-Mouse/Touchpad = Touchpad-PS/2

-Numlock LED = On

-USB Emulation = Enabled



-Internal Bluetooth = Enabled

-Internal Wi-Fi = Enabled

-Wireless Hotkey = Wi-Fi & Bluetooth


The above BIOS settings will allow you to run OS X Snow Leopard or Lion with full sleep/hibernate compatibility.

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