Back up before doing anything and know how to boot in -s mode to edit stuff in your /Extra/Extension folder in case you can't get things to work. Don't blame me if you screw up and this is probably easier if you know how to use command line.
I did this a few days ago, so hopefully I didn't miss a step.
Thanks to everyone who actually did the work, I did nothing except gather information from this forum.
I am running 10.6.3 on a D820 GMA950 w/a 32-bit cpu (T2600) at 1680x1050. I have QE/CI, ability to change resolutions on internal and external display, NO MORE ARTIFACTS, and the ability to rotate an external display (i.e., portrait mode for reading/writing). I can watch 1080p mkv videos in Plex with no stutter.
1. Installed SL using the method outlined here and apply all the updates, rebooting when prompted. After installing 10.6.3, QE/CI is gone. Don't ask for help getting to this point, this thread is filled with how to do that.
2. Go into /Extra/Extensions and remove these files:
3. run rebuild_mkext.command in the /Extra/Extensions folder
4. Using OSX86Tools, add the GFX string for intel gma 950 (laptop) to com.apple.boot.plist IN YOUR /EXTRA/EXTENSIONS file. If you forget to do this, your internal display will not be detected once the desktop loads and you'll need to plug in an external display. Mine reads:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
5a. Download and install Screen Sleeper Solution http://www.mediafire.com/?kjkdvzy2nnd
(this fixes the black screen).
5b. Go into System Preferences, enable Expose and set at least one active screen corner to "put display to sleep" (this is more of a failsafe if you need to wake up the black screen--if you get a black screen on boot move the mouse to the corner, wait a second and move it away).
6. Cross your fingers and reboot.
If you plan to use multiple monitors, by default mirror mode is used when you plug in. This results in a garbled green screen. To get around this, install MirrorDisplay before plugging in an external display and read this:
If you use a dock, the DVI port doesn't seem to work (although VGA is fine).