A kernel extension (or kext for short) is a plugin to the kernel that is in the form of a bundle (similar to apps). An example of a use if kexts would be to map the built-in keyboard for a Macbook Pro

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How to fix “invalid signature” for system kext

On Mavericks (10.9.5), in my system.log file, I noticed this line today: 7/29/15 11:24:04.039 AM com.apple.kextd[16]: WARNING - Invalid signature -67054 0xFFFFFFFFFFFEFA12 for kext ...
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How to disable SpeedStep/XCPM on Macbook Pro 11,1 OSX 10.10.2?

Does anybody know how to disable OSX from throttling/underclocking the CPU on a Macbook when the battery gets low on power? I think the feature is called SpeedStep. The problem is that my battery is ...
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2answers
382 views

Can I make my own kernel extensions on El Capitan?

I have recently heard that a feature called rootless that is going to be on El Capitan. This means that folders such as /System cannot be modified by the root user and only signed kext (kernel ...
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82 views

Cannot load the Built-in keyboard kext on Macbook pro

I needed to disable my internal keyboard for a while. What I did was try this: sudo kextunload /System/Library/Extensions/AppleUSBTopCase.kext/Contents/PlugIns/AppleUSBTCKeyboard.kext/ Though that ...
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151 views

Can anyone share original IO80211FAMILY kext for OS X Mountain Lion 10.8.5

Can anyone share original IO80211FAMILY kext file for OS X Mountain Lion 10.8.5 as I by mistake deleted it and now my WiFi has stopped working. I could not find it on Google, please if you have the ...
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121 views

VPN Tracker 6 won't work on Mac OS X Yosemite

Equinux VPN Tracker 6 won't start on Mac OS X Yosemite. When starting up, a message says Unable to load kernel extension And invites you to restart, but to no avail. Needless to say, I don't ...
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210 views

How do I uninstall a Kernel Extension in Yosemite?

I've recently reformatted my MBP to Yosemite and have run into an issue with my Logitech mouse. After doing some research I discovered that this is a longstanding issue. In the process of trying to ...
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310 views

Course of action to clean up RAM on sluggish mac

Below is an EtreCheck report on my system. My problem is that I have <3 GB or 2.5 GB even after a reboot, with relatively few menu bar applications starting up. (This drops to 20-300 MB once Chrome ...
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90 views

Options for signing kernel extensions for loading under Yosemite without apple-issued certificate?

Has anyone tried to use codesign to self-sign a previously-unsigned kext for personal use under Yosemite (10.10)? Self-signing is discussed in this apple technote, but not for kernel extensions ...
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Macbook Pro.[Mid-2012] Sound isn't working

Suddenly, My MBP sound isn't working. I have tried couple of way to resolve the problem but nothing is working. Here is some of the screenshot: No, input or output sound. I would like to know 1) ...
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25k views

How can I disable kext signing in Mac OS X 10.10 Yosemite?

I know the disadvantages of disabling kext signing, but I was wondering how I can actually disable this on Mac OS X 10.10 "Yosemite"?
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unload a kernal extension

I am trying to remove a kernel extension but every time i restart it keeps coming back how to permanently remove it? i believe this com.ab.kl.engine is some sort of spyware output of: kextstat | ...
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579 views

How to validate kexts signatures from the command line?

I'd like my shell script to verify if the /System/Library/Extensions folder (and subfolders) contains any kexts that don't pass signature validation. How do I do that? There are a couple utilities ...
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3answers
9k views

Panic on boot, need to use single user mode (was: need to rebuild kext cache)

I'm getting this at every boot on one Mac: With some searching and asking around I've found that I can get a successful boot if I boot into single-user mode, mount / as read/write, and then do ...
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1answer
436 views

Unable to boot Yosemite and old system after Upgrade to Yosemite

I have upgraded my MBP 5,1 (2,53 GHz) from Snow Leopard to Yosemite. The install went terribly wrong and now neither a fresh Yosemite, nor a fresh Snow Leopard would boot. Moving away ...
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249 views

Is there an update for the MacPro3,1 overclock utility that ZDNet produced several years ago?

The Mac Pro from 2008 (MacPro3,1) is still a fairly relevant machine in the modern OS X as not only does it run the latest releases of OSX, but also the 8 CPU cores that it came with provide enough ...
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2answers
880 views

How would I find out if an application installed the wavtap.kext as part of its package?

I'm experiencing many audiocore errors and am trying to narrow down the cause. A Google search has revealed that WavTap could potentially be the cause of these errors. WavTap is listed in my Audio ...
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452 views

IOStorageFamily / IOSCSIArchitectureModelFamily kext errors on Mavericks

Occasionally when I start up my Mid-2012 Macbook Pro, I see the following error messages a few moments after logging in: This happens about every second or third login. After seeing these error ...
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1answer
517 views

How can I clear the kernel extension caches while using FileVault 2?

I have the same problem as this user, Air + Lion : plug in USB, keyboard/pad stop working , where the built-in keyboard and trackpad on my MacBook Pro stop working (and drop out of the USB devices ...
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1answer
677 views

SCTP kernel extension for Mavericks?

I am about to do some development with SCTP using Python[1]. But this requires some kind of 3rd party kernel extensions to Mac OS X. The only link I can find about the kernel extension is completely ...
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279 views

How to take advantage of Intel's SpeedStep technology

I've never formerly know about Intel's SpeedStep capabilities in my Mac(Book Pro 5,1) until the last few days. And let me say that the possibility to make the battery last longer is good enough to ...
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1answer
660 views

Mac OS X never shuts down

When trying to shutdown or restart my Mac it just keep on showing the spinning wheel with the white background. I have waited for at least 15 minutes but nothing happens. When safe booting I can ...
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Why after installing MacPorts the kernel_task RAM size raised x1.5?

I noticed that before installing MacPorts the kernel_task RAM usage was about 200-300 Mb. After installing that the process is using 482.5 Mb real RAM. What are the components (maybe .kexts, which ...
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1k views

Error message, “hpPlugInInit.kext was installed improperly”

I recently bought a MacBook Air and transferred my system information and user data via Migration Assistant. I used to get error messages on my old computer like this: The system extension ...
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3answers
4k views

MacBookAir kernel_task at 300% and rising [duplicate]

I have a MacBookAir5,1 connected to a Thunderbolt Display. When it gets very hot, PID 0 "kernel_task" uses ever more CPU until reaching 340% and slowing the Mac down sufficiently to make me restart ...
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10k views

Are there any benefits to deleting unused Mac OS X kernel extensions?

I find that many of the kernel extensions in /System/Library/Extensions are inapplicable to my MacBook, such as extensions for fibre channel cards, firewire, graphics cards I don't have, etc. Is there ...
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2answers
3k views

TrueCrypt fails with fusefs kext error

After upgrading to Mountain Lion, I can't mount any volumes with TrueCrypt 7.1a anymore. After typing in the password for the volume, an error message is shown, stating that the fusefs kext can't be ...
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463 views

kextstat-Listed Files Not Present in Extensions Folder

I used "kextstat | grep -v com.apple" to find active extensions, and found the following listed extensions. 119 3 0xffffff7f826c7000 0x3e000 0x3e000 org.virtualbox.kext.VBoxDrv (3.2.4) ...
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1answer
655 views

Apple USB to Ethernet failed to work

I bought a USB to Ethernet adapter from Apple, and I downloaded a lot things this afternoon. After dinner, both my retina MacBook Pro and the adapter felt very hot, so I unplugged it. Now the MacBook ...
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1answer
586 views

Why does running Luxology Modo cause a marked increase in performance for other 3D graphics apps?

Original post is at the bottom, newest update at the top. ;) I didn't think to add this before, but you can download a 15-day trial of Modo for free if anyone want to try this for themselves. If ...
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3k views

How to unload kernel modules

When I run kextstat, it gives me a list of the currently loaded kernel modules. How to I go about using the information gathered from this command to unload a kernel module?
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3k views

How can I replace the original AppleIntelCPUPowermanagementClient.kext in OS X Lion?

I was playing around with Coolbook and stupidly enough deleted the two kernel extensions (kexts) without saving them to a backup location. How can I recover just ...
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166 views

Weird errors in system.log while trying to run .kext

First, I don't know if this is the correct place to put this question. Would Serverfault or Stackoverflow be better? I was running through a tutorial on making Mac Kernel Extensions. I loaded it, and ...
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1answer
850 views

Is it possible to switch from Safe Mode to Normal and back without a reboot?

Since 10.6.3, Apple has decided change the AppleIntelCPUManagement kexts, which leave me stuck with a kernel_task that pegs out at 135-185%, generating a lot of heat. Anyway, since I doubt anyone has ...
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4k views

File location of kernel extensions?

Is there an easy way to make the mapping from kernel extension to the file it came from? I can get the list of currently loaded kernel extension via kextstat. This gives me the bundle names, like ...