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  1. #1
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    820-2914 GPU Kernal panic MUX

    820-2914. I Replaced GPU

    I still have a few good chips 0084 , so I still do repairs on these .

    1 hour in testing it gives this nifty kernal

    Wed Aug 14 05:11:38 2019

    *** Panic Report ***
    panic(cpu 0 caller 0xffffff7f88fe19e9): "GPU Panic: mux-regs 4 3 7f 0 0 0 severity 3 WS-ready 1 switch-state 0 IG FBs 1 EG FBs 0:0 power-state 3 3D busy HDA idle : AGC GPU REGISTER RESTORE FAILED : rdar://7254528, VendorID invalid\n"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleGraphicsControl/AppleGraphicsControl-3.16.19/src/AppleMuxControl/kext/GPUPanic.cpp:162
    Backtrace (CPU 0), Frame : Return Address
    0xffffff90a5993aa0 : 0xffffff8007c6d366
    0xffffff90a5993ae0 : 0xffffff8007d98494
    0xffffff90a5993b20 : 0xffffff8007d8a429
    0xffffff90a5993ba0 : 0xffffff8007c1f190
    0xffffff90a5993bc0 : 0xffffff8007c6cd8c
    0xffffff90a5993cf0 : 0xffffff8007c6cafc
    0xffffff90a5993d50 : 0xffffff7f88fe19e9
    0xffffff90a5993db0 : 0xffffff7f88fde156
    0xffffff90a5993df0 : 0xffffff7f88fe13eb
    0xffffff90a5993e30 : 0xffffff80082a980c
    0xffffff90a5993ea0 : 0xffffff80082a9736
    0xffffff90a5993ed0 : 0xffffff8007ca6514
    0xffffff90a5993f40 : 0xffffff8007ca6015
    0xffffff90a5993fa0 : 0xffffff8007c1c4f7
    Kernel Extensions in backtrace:
    com.apple.driver.AppleMuxControl(3.16.19)[659DC601-9C63-3248-871F-3BC3542CFB2B]@0xffffff7f88fd3000->0xffffff7f88fe5fff
    dependency: com.apple.driver.AppleGraphicsControl(3.16.19)[50A642BF-B1E3-3F41-B211-70EFAE5BE872]@0xffffff7f88f6e000
    dependency: com.apple.iokit.IOACPIFamily(1.4)[8794C760-FDD9-3664-ADED-4A9BBEC6E517]@0xffffff7f88a58000
    dependency: com.apple.iokit.IOPCIFamily(2.9)[DF1517A2-32C4-328E-9890-03E6C546604A]@0xffffff7f88494000
    dependency: com.apple.iokit.IOGraphicsFamily(517.17)[05FC87E8-B78E-319E-AF08-0EBDA16094CE]@0xffffff7f88c21000
    dependency: com.apple.AppleGraphicsDeviceControl(3.16.19)[35BE1077-5D56-3353-BFC5-F6026B931F81]@0xffffff7f88f5c000

    BSD process name corresponding to current thread: kernel_task

    Mac OS version:
    17A365

    Kernel version:
    Darwin Kernel Version 17.0.0: Thu Aug 24 21:48:19 PDT 2017; root:xnu-4570.1.46~2/RELEASE_X86_64
    Kernel UUID: B84FDEFC-9081-35CE-8C51-25A9583AACDE
    Kernel slide: 0x0000000007a00000
    Kernel text base: 0xffffff8007c00000
    __HIB text base: 0xffffff8007b00000
    System model name: MacBookPro8,3 (Mac-942459F5819B171B)

    System uptime in nanoseconds: 2638765761627
    last loaded kext at 883163010841: com.apple.filesystems.exfat 1.4 (addr 0xffffff7f8b9ca000, size 65536)
    last unloaded kext at 989409154129: com.apple.driver.usb.AppleUSBUHCI 1.2 (addr 0xffffff7f88ecf000, size 135168)
    loaded kexts:
    org.virtualbox.kext.VBoxNetAdp 6.0.10
    org.virtualbox.kext.VBoxNetFlt 6.0.10
    org.virtualbox.kext.VBoxUSB 6.0.10
    org.virtualbox.kext.VBoxDrv 6.0.10
    com.apple.filesystems.exfat 1.4
    com.apple.filesystems.msdosfs 1.10
    com.apple.driver.AudioAUUC 1.70
    com.apple.driver.AppleHWSensor 1.9.5d0
    com.apple.driver.AGPM 110.23.24
    com.apple.filesystems.autofs 3.0
    com.apple.driver.AppleMikeyHIDDriver 131
    com.apple.driver.AppleMikeyDriver 280.12
    com.apple.AGDCPluginDisplayMetrics 3.16.19
    com.apple.driver.AppleUpstreamUserClient 3.6.4
    com.apple.driver.AppleHV 1
    com.apple.iokit.IOUserEthernet 1.0.1
    com.apple.kext.AMDLegacyFramebuffer 1.5.8
    com.apple.driver.AppleHDA 280.12
    com.apple.iokit.IOBluetoothSerialManager 6.0.0f7
    com.apple.driver.pmtelemetry 1
    com.apple.Dont_Steal_Mac_OS_X 7.0.0
    com.apple.kext.AMDRadeonX3000 1.5.8
    com.apple.driver.AppleIntelHD3000Graphics 1


    The chip I used is bad or the mux is bad?
    Last edited by John626; 08-14-2019 at 07:43 PM.

  2. #2
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    Re: 820-2914 GPU Kernal panic MUX

    ASD stops dead right at Video Controller External:Gmux switch to EG and Verify test will switch to display EG and Verify.

    Kernal pops up says to restart.

    I guess reflowing the mux would not do much , needs replacing.

    Maybe the bios is corrupt?

    ASD is unreliable seen errors when a computer worked fine.
    Last edited by John626; 08-14-2019 at 07:47 PM.

  3. #3
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    Re: 820-2914 GPU Kernal panic MUX

    Bad GPU or perhaps (I doubt it) a bad Mux.
    I have seen this messages pop out when the eGPU was dead.

    If you go to OS X and change the graphic card from integrated to external, will it hang?

  4. #4
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    Re: 820-2914 GPU Kernal panic MUX

    Preety sure it is the eGPU I thought you were saying the internal , not clicking today lol.

    I tried programming the bios with Clean ME , still does same thing.

    I'll try flowing the mux
    Last edited by John626; 08-16-2019 at 10:25 AM.

  5. #5
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    Re: 820-2914 GPU Kernal panic MUX

    eGPU is meant as external GPU, so the AMD chip. The integrated graphics on these models almost never dies, I only heard of one occasion, but I am not sure if they diagnosed it right.

    PCH does not need to be changed, only EFI ME region has to be cleaned.

  6. The Following User Says Thank You to mitchW For This Useful Post:

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  7. #6
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    Re: 820-2914 GPU Kernal panic MUX

    I saw the string of capacitors at the bottom of gpu next to the processor (0201) looked like this was reworked and they knocked them off, bad job putting them back, i'm gonna use the tweezers and get these back to normal and see what happens.

    I do notice if I run the efi variable and disable the eGPU to run the internal , it still shuts down?
    Last edited by John626; 08-16-2019 at 03:23 AM.

  8. #7
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    Re: 820-2914 GPU Kernal panic MUX

    What if you reflow the mux?

    I had a bad mux once, on 2010 machine, but it wasn't switching properly - it actually left both GPUs on at the same time and caused havoc and locked the machine up.

    There could be some other thing that might cause these problems, I would carefully examine the whole board under the microscope and try to find anything out of ordinary, especially if it was worked on before. There could be some noise that those capacitors normally filter out and now because they are missing, the machine crashes...

    But if you disable the eGPU and it still crashes, then, either is the mux chip, a bad or intermittent RAM or RAM slot, a broken trace inside the board (probably going to CPU), a bad CPU or something completely random. I doubt it would be the eGPU problem.

 

 

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