MacBook Air Ambient Light Kernel Panic Problem

Discussion in 'Mac Basics and Help' started by bradcsti, Mar 19, 2010.

  1. bradcsti macrumors newbie

    Feb 23, 2010
    I have a rev. A MacBook air that I just got up and running again after replacing the hinges along with the whole top half of the computer. I did a clean install of snow leopard, and was so happy to be using the air again.

    After changing some settings and loading a couple off apps in my room with the lights off (so I could see the backlit keyboard), I flipped on the light switch in my room, and was immediatly shown the the kernel panic screen, and was forced to shut down. I figured this was just a random occurance, so I booted back up, but was in kernel panic as soon as snow leopard booted. Went through this a couple more times, then shut the lights in my room back off, rebooted, and was able to boot up just fine. I then took a flashlight and ran the beam across the ambient light sensor, next to the camera, and was instantly in kernel panic again.

    After saying WTF for a while I decided to swap the camera/ALS/mic board over from my old screen bc I figured maybe this new one is just bad. But this resulted in more of the same. I then did a new fresh and clean snowleopard install, but about 5 mins after finishing the install, it went right back to the good old kernel panic screen.

    Now I don't really know where to go from here. The computer is way out of warranty, and after what I was quoted from my local apple repair store to repair the hinges and screen that I just fixed, I think I would just get nauseous at the thought of having to bring it to them now.

    Any insight would be greatly appreciated!
  2. BlueRevolution macrumors 603


    Jul 26, 2004
    Montreal, QC
    If replacing the board doesn't work, I suggest just putting a piece of tape over the ambient light sensor and hoping it doesn't get any worse.
  3. bradcsti thread starter macrumors newbie

    Feb 23, 2010
    I was considering the tape as a last resort. I am just hoping I can find some info on this or find some more things to try before taping in up and then putting the bezel back on. Because taking the bezel off and on is a major PITA on the Air!!
  4. bradcsti thread starter macrumors newbie

    Feb 23, 2010
    I have found today that if I adjust the brightness of the LCD to full usin the Function keys at the top of the keyboard, as soon as it hits the top brightness notch, the kernel panic screen comes up.

    Could this have something to with whatever part of the logic board handles the Signals coming through the LVDS cable could be going bad? Because I can't really think of anything else at this point.
  5. bradcsti thread starter macrumors newbie

    Feb 23, 2010
    I dont know if this has any meaning to any of you out there. But I am not really sure how to interpret this Kernel Panic Log:

    Mon Mar 22 17:45:45 2010
    panic(cpu 1 caller 0x34d7c68a): "IG: Invalid backlight duty cycle value"@/SourceCache/GraphicsDrivers/GraphicsDrivers-6.6.25/Common/GLKernel/Intel/IntelIntegratedFramebuffer/IntelGMAX3100FB.cpp:7179
    Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
    0x3492bb48 : 0x21b2bd (0x5cf868 0x3492bb7c 0x223719 0x0) 
    0x3492bb98 : 0x34d7c68a (0x34d8cb08 0x3fe0f9c 0x0 0x2337fb) 
    0x3492bbb8 : 0x34d8aceb (0x4c6c400 0x5f40 0x3492bbe8 0x26d042) 
    0x3492bc08 : 0x34b863c3 (0x4c2c000 0x0 0x626b6c74 0x5f40) 
    0x3492bc78 : 0x34b55a0c (0x4c68900 0x4a3bfc0 0x3ed5480 0x80) 
    0x3492bca8 : 0x34b541c6 (0x5364c00 0x4a3bfc0 0x3ed5480 0x80) 
    0x3492bcd8 : 0x34b53c71 (0x5364c00 0x80 0x3492bd08 0x4fcc49) 
    0x3492bcf8 : 0x34b53bcd (0x5364c00 0x80 0x3492bd28 0x4fc7d6) 
    0x3492bd18 : 0x34b55e9f (0x5364c00 0x4d081c0 0x3ed5480 0x80) 
    0x3492bd48 : 0x34b5622b (0x5364c00 0x4d081c0 0x3ed5480 0x80) 
    0x3492bdc8 : 0x562518 (0x5364c00 0x5624800 0x44 0x2a0596) 
    0x3492be18 : 0x28837b (0x5364c00 0x4015300 0x44 0x5da08b8) 
    0x3492be58 : 0x21d65f (0x5db5c84 0x5da0894 0x1fe408 0x5db5cb0) 
    0x3492be98 : 0x2107f7 (0x5db5c00 0x3492bedc 0x4fed1ec 0x3492bed0) 
    0x3492bef8 : 0x216a5a (0x5db5c00 0x0 0x0 0x0) 
    0x3492bf78 : 0x292834 (0x498e068 0x0 0x0 0x0) 
    0x3492bfc8 : 0x29e44d (0x498e064 0x0 0x10 0x498e064) 
          Kernel Extensions in backtrace (with dependencies):
    BSD process name corresponding to current thread: loginwindow
    Mac OS version:
    Kernel version:
    Darwin Kernel Version 10.2.0: Tue Nov  3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386
    System model name: MacBookAir1,1 (Mac-F42C8CC8)
    System uptime in nanoseconds: 8911468369707
    unloaded kexts:	2.0.2 (addr 0x34806000, size 0x24576) - last unloaded 106055554596
    loaded kexts:
    se.coolbook.driver2	2.0.9	2.1.0 - last loaded 36059649138	2.0.0d2	7.0.0	1.9.2d0	1.1.2	1.7.9a4	6.0.6	3.1.0	3.0.0d4	1.4.5d1	421.91.26	19	4.0.1d0	1.4.9	170.0.14	6.0.6	1.8.0b4	1.8.0b4	251.1.4	31	1.0.0d1	3.8.4	2.5.0	3.7.5	3.7.5	1.3.0	1.3	1.4	160.0.0	1.3	1.4	1.3	1.4	0	0	2.1.11	96.0.0	96.0.0	17	10	14	10	10	20	2.6.0	73.0	2.2.4f3	10.0.3	1.7.9a4	1.7.2fc1	1.3	310.6	1.9	41	1.7.9a4	1.7.9a4	4.0.1d0	2.0	3.0.1d2	2.0	204.9	2.2.4f3	2.2.4f3	2.2.4f3	3.8.4	3.8.5	3.7.5	402.1	2.5.0	3.8.5	2.5.0	3.8.5	1.3.0	1.6.1	1.1	6	1.0.0d1	281	1.6	1.3	2.6	1.3.0
  6. mattydagee macrumors newbie

    Mar 6, 2014
    Solved the issue

    Hi all,

    I solved the issue. I had this exact problem with a MacBook Air 1,1 that came through my repair shop.

    Here are the steps to resolve the issue:
    1. Find a machine with OS X 10.5 (in my case, I installed 10.5.0 onto a USB drive connected to the MacBookAir).
    2. Copy the following file off the 10.5 system, and drop it on the desktop of the MacBookAir: /System/Library/Extensions/AppleIntelGMAX3100FB.kext
    3. Install the new .kext file by dragging it into Kext Utility (which can be downloaded here:
    4. Shut down the machine. Reset SMC and PRAM (SMC:, PRAM:
    5. Boot, and enjoy!
  7. Altemose macrumors G3


    Mar 26, 2013
    Elkton, Maryland
    Try resetting the SMC and PRAM. If that fails try Mattys steps. If that still doesn't work try disabling the Ambient Light Sensor in System Preferences.
  8. DeltaMac macrumors 604


    Jul 30, 2003
    You're also running OS X 10.6.2, for some reason.
    Download and install the 10.6.8 combined updater, here:
    then run your software update to pick up your system to fully up-to-date. That would possibly replace your Leopard kext for the light sensor "fix", so you should make sure to keep that file if you need it for a fix after your system is updated.

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