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 uninstall Corel Painter Internal Audio Driver in OS X Yosemite

I had installed Corel Painter 2016 on OS X Yosemite 10.10.5 with its .pkg installer. I removed installed files from /Applications/ by dragging them to the Trash. Today I noticed that there is an ...
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os x - How to disconnect then reconnect usb devices using programming methods?

I have several usb devices (controllers for other equipments) connected to my mac (version "Snow Leopard"). Sometimes these devices do not work and need to be physically reconnected. These devices are ...
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70 views

Are there any dangers of setting kext-dev-mode to 1?

I am trying to make a driver work on my OSX 10.11. A guide that I am following requires the execution of the following command: sudo nvram boot-args="kext-dev-mode=1" followed by: sudo kextload ...
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72 views

Bluetooth mouse won't work on FileVault 2 machine until after login

On a machine with FileVault 2 enabled, my Apple Magic Mouse does not work until after I log in. After login, the mouse works and I can tell from IORegistryExplorer that /System ...
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309 views

Mac Pro 3.1 with Yosemite won't boot after GenericUSBXHCI USB 3.0 .kext added

I was trying to install drivers for my NEC USB 3.0 PCI card. ( propably http://sourceforge.net/projects/genericusbxhci/files/ or https://github.com/RehabMan/OS-X-Generic-USB3 ) I rebooted my mac into ...
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USB tethering gone after upgrading to iOS 9 and iTunes 12.3

After upgrading my iPhone 6 to iOS 9, and iTunes to 12.3, I cannot use the Personal Hotspot via USB anymore. It worked fine until the updates. Through WiFi it works fine, so the cause is not that ...
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88 views

Kernel Panic Bluetooth

I have been receiving kernel panics a few times in the past few months, but each time I have noticed it is when I am connected to the internet through Bluetooth PAN to my iPhone. Most recently, the ...
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146 views

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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484 views

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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3answers
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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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289 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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364 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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1answer
252 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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409 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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640 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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208 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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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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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
14k 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
488 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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Is there source code or 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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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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546 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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712 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
893 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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306 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
848 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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0answers
63 views

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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1answer
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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5k 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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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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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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528 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
719 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
627 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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1answer
4k 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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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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2answers
188 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
916 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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1answer
5k 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 ...