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 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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975 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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165 views

Can't find kernel.log file on Yosemite

I began kernel programming on mac. Because I want to run my kernel extensions without code signing I had to do the following: sudo nvram boot-args=kext-dev-mode=1 It works as it should be, but the ...
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914 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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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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Suspicious warning about a Kernel Extension

This morning i received this warning from BlockBlock about a new kernel extension being installed. I'm running OS X 10.11.4. I looked up on google and found out that it could be related to a ...
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439 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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516 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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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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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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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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Problem with kextunload SD card remount

So I got one of those SD card flush mounts, but it occasionally self ejects. I'm trying to solve that via kextunload given on this page Entering: sudo kextunload -b ...
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Is there source code or an update for the Mac Pro 3,1 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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573 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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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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3 views

Enabling TSX on OSX

How can I enable TSX on my Mac? The furthest I got was by trying to add a kext that would enable me to r/w to the ms registers but I can't install non signed kexts on my mac. Any alternatives?
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kernel extension is not always loaded at boot time on OSX

I do have a kernel extension for USB-Devices using IOKitPersonalities. Replugging one of the devices the kext will always be loaded as expected but for devices already connected at startup this ...
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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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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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106 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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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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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 ...