Our fix today comes from user "guilleamodeo", from the Apple Knowledge Base. The full discussion can be found here: https://discussions.apple.com/message/25114007#25114007
I originally saw this problem on a 2008 Macbook Air. Directly after I replaced the LCD cable (which involved removing the front face of the LCD screen) the computer would go to Kernel Panic immediately, whenever the screen brightness was set to Full. Although this KP was constant, I did see other Kernel Panics, both on booting the computer, as well as using the camera.
Though some people point to a specific driver update after OS X 10.5.2, one item for sure that is causing the issue is the Apple Backlight control. You can see this when reviewing the Diagnostics Report, as it is the last item loaded. There is a brief moment, right before the Log In screen, where you will see the screen flash - this is the operating system adjusting the lighting. It will try to adjust to full, causing the Kernel Panic.
THE FIX
This fix, unfortunately, has a side effect. You will no longer be able to control the brightness using the keyboard keys. Be advised. You will be adjusting the filesystem directly.
1. Boot into single user mode (hold the Command - S keys on boot up)
2. Open Terminal, and enter /sbin/fcsk -fy then /sbin/mount -uw /
3. Next, in Terminal, type mv -r /System/Library/Extensions/com.apple.AppleBacklightExpert.kext /oldext
This will move the .kext which gives control of the backlight to a separate folder, effectively "disabling" it.
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