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  1. #1


    Member Since
    Mar 13, 2010
    Posts
    6
    Question Macbook Air Kernel Panic with Brightness Adjustment
    I have a Macbook Air rev. A, that I just finished replacing the hinges, LVDS cable, and LCD. After being reassembled and having a fresh install of snow leopard installed on the HDD, I am now having kernel panic problems.

    The computer boots up just fine, but then there are two cases where the kernel panic freezes up the computer. If in the Display settings, the option is checked for display to automatically set the brightness, the KP screen comes up if i shine a flashlight at the isight/ambient light sensor, or if the lights in the room are just bright to begin with. If this setting is unchecked then the KP does not come up. The second case, is that whether or not the Automatic brightness setting is checked, if I use the Brightness keys at the top of the keyboard, as soon as it is set to the full setting the KP screen comes up, and I am forced to reboot.

    I have swapped out the isight/Ambient Light Sensor with one from another MB Air, but it did not change anything. Has anyone ever had anything like this happen to their Macbook? I am having a hard time figuring out what the **** is going on inside of this thing. I do not have a applecare warranty, so bringing it to them is not really an option. Could the Logic Board cause this type of event to happen? Does the Logic Board even have anything to do with the LCD Brightness setting or Ambient Light Sensor?

    Thanks in advance for any insight
    -brad

  2. #2


    Member Since
    Sep 29, 2009
    Posts
    70
    where did you get the parts from?
    you know apple probably has proprietary hinges even, lol;
    if something is unrecognized or not tested with the graphics controller this could cause a kernel panic

  3. #3


    Member Since
    Mar 13, 2010
    Posts
    6
    Arrow
    how could i figure out what is causing the crash though?

  4. #4

    clayneal's Avatar
    Member Since
    Mar 27, 2009
    Location
    Lincoln Nebraska
    Posts
    2,146
    Specs:
    late 08 macbook 2.0 4gig 320hdd10.7.3 32 gig iPhone 4s
    The low voltage tech in me says you have a short some where as the KP is triggered by screen adjust either manually or auto . I would start my trouble shooting with the LVDS cable.


    Hope it helps
    Clay
    MY ADVICE COMES WITH A DOUBLE YOUR MONEY BACK GUARANTEE!

  5. #5


    Member Since
    Mar 13, 2010
    Posts
    6
    Exclamation
    Does anybody know how to interpret this?
    This is the KP Log:

    Code:
    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):
             com.apple.driver.AppleBacklight(170.0.14)@0x34b85000->0x34b88fff
                dependency: com.apple.iokit.IOGraphicsFamily(2.0)@0x34b52000
                dependency: com.apple.iokit.IONDRVSupport(2.0)@0x34d27000
                dependency: com.apple.iokit.IOPCIFamily(2.6)@0x2e9ed000
             com.apple.driver.AppleIntelGMAX3100FB(6.0.6)@0x34d7a000->0x34d90fff
                dependency: com.apple.iokit.IOACPIFamily(1.3.0)@0x2e853000
                dependency: com.apple.iokit.IOPCIFamily(2.6)@0x2e9ed000
                dependency: com.apple.iokit.IOGraphicsFamily(2.0)@0x34b52000
                dependency: com.apple.driver.AppleSMC(3.0.1d2)@0x34b70000
             com.apple.iokit.IOGraphicsFamily(2.0)@0x34b52000->0x34b6ffff
                dependency: com.apple.iokit.IOPCIFamily(2.6)@0x2e9ed000
    
    BSD process name corresponding to current thread: loginwindow
    
    Mac OS version:
    10C540
    
    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:
    com.apple.iokit.IOAHCIFamily	2.0.2 (addr 0x34806000, size 0x24576) - last unloaded 106055554596
    loaded kexts:
    se.coolbook.driver2	2.0.9
    com.apple.filesystems.autofs	2.1.0 - last loaded 36059649138
    com.apple.driver.ApplePlatformEnabler	2.0.0d2
    com.apple.Dont_Steal_Mac_OS_X	7.0.0
    com.apple.driver.AppleHWSensor	1.9.2d0
    com.apple.driver.AudioIPCDriver	1.1.2
    com.apple.driver.AppleHDA	1.7.9a4
    com.apple.driver.AppleIntelGMAX3100	6.0.6
    com.apple.driver.AppleUpstreamUserClient	3.1.0
    com.apple.driver.SMCMotionSensor	3.0.0d4
    com.apple.kext.AppleSMCLMU	1.4.5d1
    com.apple.driver.AirPortBrcm43xx	421.91.26
    com.apple.driver.AppleIntelMeromProfile	19
    com.apple.driver.ACPI_SMC_PlatformPlugin	4.0.1d0
    com.apple.driver.AppleLPC	1.4.9
    com.apple.driver.AppleBacklight	170.0.14
    com.apple.driver.AppleIntelGMAX3100FB	6.0.6
    com.apple.driver.AppleUSBTCButtons	1.8.0b4
    com.apple.driver.AppleUSBTCKeyboard	1.8.0b4
    com.apple.driver.AppleIRController	251.1.4
    com.apple.BootCache	31
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib	1.0.0d1
    com.apple.driver.AppleUSBHub	3.8.4
    com.apple.driver.AppleIntelPIIXATA	2.5.0
    com.apple.driver.AppleUSBEHCI	3.7.5
    com.apple.driver.AppleUSBUHCI	3.7.5
    com.apple.driver.AppleEFINVRAM	1.3.0
    com.apple.driver.AppleRTC	1.3
    com.apple.driver.AppleHPET	1.4
    com.apple.driver.AppleSmartBatteryManager	160.0.0
    com.apple.driver.AppleACPIButtons	1.3
    com.apple.driver.AppleSMBIOS	1.4
    com.apple.driver.AppleACPIEC	1.3
    com.apple.driver.AppleAPIC	1.4
    com.apple.security.sandbox	0
    com.apple.security.quarantine	0
    com.apple.nke.applicationfirewall	2.1.11
    com.apple.driver.AppleIntelCPUPowerManagementClient	96.0.0
    com.apple.driver.AppleIntelCPUPowerManagement	96.0.0
    com.apple.driver.AppleProfileReadCounterAction	17
    com.apple.driver.AppleProfileTimestampAction	10
    com.apple.driver.AppleProfileThreadInfoAction	14
    com.apple.driver.AppleProfileRegisterStateAction	10
    com.apple.driver.AppleProfileKEventAction	10
    com.apple.driver.AppleProfileCallstackAction	20
    com.apple.iokit.IOSCSIArchitectureModelFamily	2.6.0
    com.apple.iokit.IOSurface	73.0
    com.apple.iokit.IOBluetoothSerialManager	2.2.4f3
    com.apple.iokit.IOSerialFamily	10.0.3
    com.apple.driver.DspFuncLib	1.7.9a4
    com.apple.iokit.IOAudioFamily	1.7.2fc1
    com.apple.kext.OSvKernDSPLib	1.3
    com.apple.iokit.IO80211Family	310.6
    com.apple.iokit.IONetworkingFamily	1.9
    com.apple.iokit.AppleProfileFamily	41
    com.apple.driver.AppleHDAController	1.7.9a4
    com.apple.iokit.IOHDAFamily	1.7.9a4
    com.apple.driver.IOPlatformPluginFamily	4.0.1d0
    com.apple.iokit.IONDRVSupport	2.0
    com.apple.driver.AppleSMC	3.0.1d2
    com.apple.iokit.IOGraphicsFamily	2.0
    com.apple.driver.AppleUSBMultitouch	204.9
    com.apple.driver.BroadcomUSBBluetoothHCIController	2.2.4f3
    com.apple.driver.AppleUSBBluetoothHCIController	2.2.4f3
    com.apple.iokit.IOBluetoothFamily	2.2.4f3
    com.apple.iokit.IOUSBHIDDriver	3.8.4
    com.apple.driver.AppleUSBMergeNub	3.8.5
    com.apple.driver.AppleUSBComposite	3.7.5
    com.apple.driver.XsanFilter	402.1
    com.apple.iokit.IOATABlockStorage	2.5.0
    com.apple.iokit.IOUSBUserClient	3.8.5
    com.apple.iokit.IOATAFamily	2.5.0
    com.apple.iokit.IOUSBFamily	3.8.5
    com.apple.driver.AppleEFIRuntime	1.3.0
    com.apple.iokit.IOHIDFamily	1.6.1
    com.apple.iokit.IOSMBusFamily	1.1
    com.apple.security.TMSafetyNet	6
    com.apple.kext.AppleMatch	1.0.0d1
    com.apple.driver.DiskImages	281
    com.apple.iokit.IOStorageFamily	1.6
    com.apple.driver.AppleACPIPlatform	1.3
    com.apple.iokit.IOPCIFamily	2.6
    com.apple.iokit.IOACPIFamily	1.3.0

  6. #6


    Member Since
    Sep 29, 2009
    Posts
    70
    it seems like the drivers are causing the kernel panic, even if they installed fine;
    were the parts intended for your specific model of MBA?
    or are they interchangeable with other macbook models, or intended for other models?
    in that output, it seems like everything is fine except for some conflict with the drivers that were installed;
    actually as i look over it, it seems like there may be some need for the driver dependencies that i would guess are on a pro or unibody but dont come standard on the air, particularly:
    dependency: com.apple.iokit.IOGraphicsFamily
    dependency: com.apple.iokit.IONDRVSupport
    dependency: com.apple.iokit.IOPCIFamily
    dependency: com.apple.iokit.IOACPIFamily
    dependency: com.apple.iokit.IOPCIFamily
    dependency: com.apple.iokit.IOGraphicsFamily
    dependency: com.apple.driver.AppleSMC
    dependency: com.apple.iokit.IOPCIFamily

  7. #7


    Member Since
    Mar 13, 2010
    Posts
    6
    Arrow
    from all the 'researching' i did on the internet, and making some calls, I found that all of the macbook air's use the same LCD screen. I checked the Model number on the back of the LCD anyway, and its the same exact model number manufactured by A.U. Optronics.

    I ended up buying a whole top clamshell from another macbook air that included the LCD, Aluminum backplate, LVDS cable, mic cable, and hinges. I installed that and did a format and install of Snow Leopard, which went fine, with no errors, but now i have all these kernel panics.

    so far i have found that if i raise the LCD backlight brightness to full i get a KP every time. If i try to use the iSight camera, as soon as it starts recording, I get a KP every time, if I set the computer to automatically set the LCD backlight brightness, if any light is shined on the Ambient Light Sensor, I get a KP everytime.

    Its quite frustrating to have a working laptop, but with things that you CANNOT do bc it will crash every time.

  8. #8


    Member Since
    Sep 29, 2009
    Posts
    70
    ...
    apparently you are quite confident in the physical parts themselves and their sources;
    if 10.6 installs fine, and the monitor works to a certain extent, enough to allow you to install 10.6, this has been the same problem between two different display assemblies and fresh installs, the parts are correct and supported or at least tested by apple;
    then you have a problem with the hardware somewhere between where the display connects (parts that were replaced twice by yourself) passing through the graphics controller, to the MB;
    i am not very familiar with the specifics in hardware between macbook air and your average desktop;
    but the circumstances you described would lie somewhere in:
    connection from display==>graphics controller==>bus==>MB
    unless i am misunderstanding,a: you tried two different display assemblies and got the same problem, b: monitor works initially after POST, c: tried more than one fresh installs of 10.6 after which the monitor works to a certain extent;

  9. #9


    Member Since
    Mar 13, 2010
    Posts
    6
    Question
    Quote Originally Posted by bboyreason View Post
    apparently you are quite confident in the physical parts themselves and their sources;
    if 10.6 installs fine, and the monitor works to a certain extent, enough to allow you to install 10.6, this has been the same problem between two different display assemblies and fresh installs, the parts are correct and supported or at least tested by apple;
    then you have a problem with the hardware somewhere between where the display connects (parts that were replaced twice by yourself) passing through the graphics controller, to the MB;
    i am not very familiar with the specifics in hardware between macbook air and your average desktop;
    but the circumstances you described would lie somewhere in:
    connection from display==>graphics controller==>bus==>MB
    unless i am misunderstanding,a: you tried two different display assemblies and got the same problem, b: monitor works initially after POST, c: tried more than one fresh installs of 10.6 after which the monitor works to a certain extent;
    you got it right. after installing the second lcd, and after installing 10.6 freshly mulitple times, I am still stuck with the problems I described above.

    The macbook air comes with a version of 10.5 that is solely made for the Air. Could the version of Snow Leopard that I have be causing the problems bc it is not made specifically for the Air?

  10. #10


    Member Since
    Sep 09, 2010
    Posts
    2
    Same trouble
    Hi,

    I had the same issue. and have search around for a solution.

    Get Kernel panic when:
    - brightness to maximum (or second last)
    - using camera (after install) camera works fine when registering after fresh install. Photobooth wants to take a picture for profile and this works fine.
    Using photobooth after setup, fails into kernel panic.
    - also seen that if computer is active all day turns into kernel panic.
    (probably the ambient light sensor triggering brightness)

    I was thinking this could have something to do with OSX update.
    I installed 10.6.2 -> the patched and updated.
    But it also happens with a fresh install. :-(

    I have checked rom updates, and I believe that my system is up to date.

    I have a second hand macbook air rev a (macbook 1.1 x3100)
    Probably with a changed LCD hinges. (see marks after opening the monitor, so this is not apple work. They always replace the hole screen.)

    Anyone found a solution to the problem.

    My solution for the moment:
    - disable ambient light sensor (in control panel)
    - not using the camera (could be removed from OS, some solutions out there for moving some files around)
    - keep from turning brightness to max. (may be it also could be tuned not to go into max with some software?)

    But if anyone found the correct fix, please let me know.
    I am hoping that a patch could fix this issue. Since the camera actually is working before setup is run. :-)

    --
    Jan Erik

  11. #11


    Member Since
    Sep 09, 2010
    Posts
    2
    Quote Originally Posted by janew View Post
    Hi,

    I had the same issue. and have search around for a solution.

    Get Kernel panic when:
    - brightness to maximum (or second last)
    - using camera (after install) camera works fine when registering after fresh install. Photobooth wants to take a picture for profile and this works fine.
    Using photobooth after setup, fails into kernel panic.
    - also seen that if computer is active all day turns into kernel panic.
    (probably the ambient light sensor triggering brightness)

    I was thinking this could have something to do with OSX update.
    I installed 10.6.2 -> the patched and updated.
    But it also happens with a fresh install. :-(

    I have checked rom updates, and I believe that my system is up to date.

    I have a second hand macbook air rev a (macbook 1.1 x3100)
    Probably with a changed LCD hinges. (see marks after opening the monitor, so this is not apple work. They always replace the hole screen.)

    Anyone found a solution to the problem.

    My solution for the moment:
    - disable ambient light sensor (in control panel)
    - not using the camera (could be removed from OS, some solutions out there for moving some files around)
    - keep from turning brightness to max. (may be it also could be tuned not to go into max with some software?)

    But if anyone found the correct fix, please let me know.
    I am hoping that a patch could fix this issue. Since the camera actually is working before setup is run. :-)

    --
    Jan Erik
    Just tested with photoboot again, hangs, but the camera works fine.
    Something happens when the image is to be taken. Then the kernel panics appears.

    Maybee it adjust some settings with brightness or something to make the image better.? I do not think the camera is the problem, but some command it runs when capturing the image.

    Excactly the same kernel panic as if I adjust the brightness to max manually:
    panic(cpu 1 caller 0x34dc76b6): "IG: Invalid backlight duty cycle value"@/SourceCache/GraphicsDrivers/GraphicsDrivers-6.18.18/Common/GLKernel/Intel/IntelIntegratedFramebuffer/IntelGMAX3100FB.cpp:7189

  12. #12


    Member Since
    Dec 05, 2011
    Posts
    1
    Partly figured out...
    I have two macbook air (original Jan 2008) laptops. I bought them to fix them, as both just needed LCDs. I erased the HD and installed snow leopard 10.6 and ran updates to 10.6.8 and then installed Lion, on both. This is the point when I was lucky to suffer the same kernel panic with the brightness as well as when a photo is taken in photobooth. I thought it was the LCD, cable, or whatever. I never thought it would be software.

    I decided to reinstalled the OS that came on the original disks for the Air. It came with 10.5.2 Leopard with the software on disk 2 (iLife, etc...). After reinstalling from those disks, BOTH computers work PERFECT! No Panics at all.

    HOWEVER, this is why I said "Partly figured out"... As soon as I attempt to install any update to update to 10.5.8 via software update or even install 10.6 from a disk image, it'll update, then give me the kernel panics again on brightness and photobooth photo taking (which causes the screen to flash bright white for the "flash")

    So if anyone has any idea how to upgrade the original Macbook Air past what came in the box on the DVDs which were included, that'd be great!! It definitely seems like the Updates screw up some kext (drivers) that conflict or delete the ones that came on the Macbook Air specific DVDs.

    I know it's an old thread, but if anyone erases their HD and tries to install 10.6 or 10.7 this should happen to everyone...

    Any ideas???

  13. #13


    Member Since
    Jan 29, 2012
    Posts
    1
    Hi same issue after replacing screen for second time. 1st screen no issues but replaced when I damaged the screen. Also backlite keyboard no longer working. Boots fine in safe boot !!!

  14. #14


    Member Since
    Feb 27, 2012
    Posts
    1
    Same problem
    So I realize this thread is a tad old but I did happen to stumble upon it today (and noticed someone posted yesterday!).

    I've had the same problem as you guys. I'll post a TL - DR at the bottom for those who don't want to read the whole story (and I'm a new Mac-Forums user(usually use macrumors); so please go easy on me!).

    I like to fix things. I fix macbooks, mac pros, imacs, iphones, ipods, etc (and other electronics.. just prefer macs). I do it for fun as a hobby (currently in college). I'm not a trained apple tech, but I learn quickly (I've posted several of my "fix-its" on Youtube. Back in the summer of 2011, I was visiting my relatives in Colorado and someone had a macbook air (1st gen model) for sale. It had a broken screen. "Perfect" I thought! So I bought it. It turns out that some kid (about my age.. late teens/early 20's) said he'd charged it and it turned on when he checked it but it wasn't turning on for me (and he did have pictures posted on his craiglist ad of it working). So I bargained and managed to get him to drop the price. I bought it, took it back to my relatives and tested it out. I plugged it it and it turned on! Unplugged it and it immediately shut down. I figured it just needed a new screen and new battery. I ordered them online and had them sent to my home in Washington where they were waiting for me when I got back a week later.

    Went to take it apart, and guess what, it didn't need a battery - when the kid dropped it and broke the screen, the battery was disconnected (hence why it worked when it was plugged in). I replaced the screen and installed a fresh copy of Snow Leopard on it. I went back to school and kept it in my room. Contemplating selling it online; thought about keeping it because it's neat (even though I already have a macbook). Well, I finally decided to sell it but tested it out and got TONS of kernel panics (hadn't touched it since I fixed it).

    I brought it to apple and the techs were pretty helpful. Turns out the HDD was failing. SO I bought one of those to fix that (APPLE WAS GOING TO CHARGE $400 TO REPLACE IT SINCE IT'S OUT OF WARRANTY... the 1st gen model is only worth about 400! lol)

    Fixed that and reinstalled the OS again. It seems to be working fine. However, I just tested the OP's theory of ambient light sensor and brightness and I got a KP! It actually made me laugh pretty hard!

    TL -DR - Bought broken MBA 1st gen, fixed screen and installed SL. Didn't touch it for months. Turned it on got tons of Kernel Panics, replaced HDD (NOT with a SSD..just a regular HDD). Reinstalled SL (again). Worked fine until I got one more KP and saw "invalid back light". Googled that - came here, tested ambient light sensor and brightness, got KP! Laughed.

    Anyone solve this problem yet? I am posting from the MBA right now, however. Giggling on the inside.

  15. #15


    Member Since
    Aug 13, 2012
    Posts
    2
    Macbook Air Kernel Panic with Brightness Adjustment
    Quote Originally Posted by baileyw813 View Post
    I have two macbook air (original Jan 2008) laptops. I bought them to fix them, as both just needed LCDs. I erased the HD and installed snow leopard 10.6 and ran updates to 10.6.8 and then installed Lion, on both. This is the point when I was lucky to suffer the same kernel panic with the brightness as well as when a photo is taken in photobooth. I thought it was the LCD, cable, or whatever. I never thought it would be software.

    I decided to reinstalled the OS that came on the original disks for the Air. It came with 10.5.2 Leopard with the software on disk 2 (iLife, etc...). After reinstalling from those disks, BOTH computers work PERFECT! No Panics at all.

    HOWEVER, this is why I said "Partly figured out"... As soon as I attempt to install any update to update to 10.5.8 via software update or even install 10.6 from a disk image, it'll update, then give me the kernel panics again on brightness and photobooth photo taking (which causes the screen to flash bright white for the "flash")

    So if anyone has any idea how to upgrade the original Macbook Air past what came in the box on the DVDs which were included, that'd be great!! It definitely seems like the Updates screw up some kext (drivers) that conflict or delete the ones that came on the Macbook Air specific DVDs.

    I know it's an old thread, but if anyone erases their HD and tries to install 10.6 or 10.7 this should happen to everyone...

    Any ideas???
    Same situation with my Macbook Air Gen A. After replacing the display I started immediately to experience Kernel Panics at full brightness. So I decided to upgrade to snow leopard with the same results. Then downgraded to Leopard with identical results.
    So I installed the original OSX that came with my computer and voila !! no Kernel panics.
    The version I installed was 10.5.4, 9E25 refered in the following link : Mac OS X versions (builds) for computers
    You can get this version after googling in rapidshare.

    Now, I'm looking for a way to upgrade to snow leopard or at least 10.5.8.

    If you have similar experiences please share with us.

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