Hey Folks,
first of all i want to apologise for my bad english.
I installed OSx86 on the Dell D420 and would like to share my experience and expand my knowledge. My goal is to get everything running properly....but this not realistic, i know. This is how far i came right now on this issue. If you got a solution for a problem, please post it here, that we can get a complete how to for the d420.
even if you got other dell notebooks, with identical hardware parts, feel free to share your knowledge.
I try to post the detailed hardware specifications of the D420 later on by updating this post.

Installation:

• i used the Kalyway 10.5.1 dvd
• deactivate one core of the processor in bios before installation
• partition your HDD with MBR partitiontables
• select the MBR Bootloader in Custom Installation and deselect the efi bootloader

I didn't tried efi, cause i dont have a clue about it, if you got chameleon running, or anything else, that allows you to use vanilla kernel, please post the way in this thread.

Things that worked out of the box:

• the processor Intel Core Duo U2500 with only one core acitvated
• the dell wireless adapter
• the trackpad, trackpoint and all 4 buttons
• the graphic chipset GMA950

I experienced slightly artifact problems in the upper left corner of the screen, just below the apple.

Things that need some tuning:

• sound: You need the AppleHDAPatcher 1.20 by Taruga(thank you!) and the 9200.txt. Start AppleHDAPatcher, drag the 9200.txt and drop it in the window of the patcher. follow the instructions on screen and reboot.

Helpfull links:
http://forum.insanelymac.com/index.php?showtopic=32859
http://wiki.taruga.net/tiki-index.php the link to download the stuff you need

The speakers should work now, i dont know about the microphone and earplug jacks but when someone tried them, he could report his experiences. You even get this nice "volume animation" from osx when you adjust the volume with your keyboard...only the mute button is not working.

• battery: You need the PowerManagement-137-1.bundle.tar.gz from Jaro(thank you!). Extract the archive and replace the PowerManagement.bundle in /System/Library/SystemConfiguration with the one you have just extraced....but don't forget to backup your old PowerManagement.bundle. Reboot your machine and go to System Prefernces>Energy Saver>Options and enable the checkbox "Show battery status in the menu bar".

Helpfull links:
http://forum.insanelymac.com/index.php?showtopic=80425 the link to download the stuff you need

The battery status indicator should work now, but it works only with percentage, not with the time remaining. If someone got a solution for this problem feel free to share it in this thread.

Things i didn't got to work properly:

• sleep: i didn't found any walkthrougs, etc for that problem, if you got one, please post it

Update:
I just found one, but didnt had the time to go throug it. If someone did that allready feel free to share your experiences.
Walkthrough:
http://forum.insanelymac.com/index.php?showtopic=42865

• dual core: i did a lot of research on this issue, it seems to be a problem with the dell bios which is not fixed at the moment.

• 2 finger scrolling: i tried it various times with various settings, but my mouse pointer was stuttering and the scrolling was pretty {censored}ed up....can't describe it, it was just wierd. I found a detailed walkthrough but i didnt got it working.

Walkthrough:
http://forum.insanelymac.com/index.php?showtopic=88811

• fan control: since my d420 becomes really hot, when running osx i did some research and found two solutions, but none of the worked for me.

Solution I:
http://potatosaladx.blogspot.com/2007/06/i...-with-dual.html
Some guy called nawcom said in the comments that he got it running on the D420, but i don't know how to contact him.

Solution II:
http://paulicat.freeflux.net/blog/archive/...-under-osx.html

• ethernet controller: i found a detailed walkthrough but nearly everybody experiences some errors with that controller. but im not really sure about that, cause most people dont use the detailed name of their controller in the thread. the dell d420 got a bcm5752 eithernet controller.

Walkthrough:
http://forum.insanelymac.com/index.php?showtopic=4987

Update:
I got the fixed kext for the bcm5701 installed, and it is not failing loading at the systemstart, but there is no eithernet controller in system profiler?!

Update II:
I just found another hint, but i dont get what he means....when i change my setting like that, i have no wireless anymore i think.
http://www.hackint0sh.org/forum/showthread.php?t=864#3

Things i didnt try to get working:

• modem
• onboard cardreader
• efi

Will be updated....