I just signed up to confirm that with current svn's of EDP the screen brightness is way down and it flickers a bit until you manually set the brightness to max. I have this issue on both my D420 and my D820. Brightness fix is applied. It doesn't happen with older EDP releases. It also happened on Lion but it was easily fixed there using the AppleFrameBuffer.kext from the installer. Hope someone can find a fix for this in the current EDP.