Legacy AppleACPIThermal & AppleACPIEC Kexts

Anyway here we go a patched AppleACPIThermal and AppleACPIEC (which is backported from 2005 , aka OSX 10.4.1 for OSX 10.6). You may ask – Why on earth you want to do that. Well , I’ve many reasons for doing so. The primary reason is for me to control the fan speeds , at least so that its not that noisy and mainly to activate Thermal sensors of the computer so that OSX sort of knows when to shut down the PC when its too hot . Technically you should get a warning saying that your PC is too hot and you should shut it off and wait for it to cool. These kexts are meant for laptops (portable computers) and netbooks alike . They DO NOT WORK ON DESKTOP COMPUTERS

So what on earth is EC (Electronic Controller) and Thermal Zone ?

Basically how it works is by using pure ACPI calls. I’ve managed to get some of the idea , on how it works. Electronic Controller is something like homeostasis , i.e when your blood sugar content is high – how your body brings it down . Same goes to your laptop. If it senses that the laptop is too hot , it tries to bring down the temperature by cutting down on power consumption (i.e sending HALT commands or forcing the CPU to go into full energy-saving mode , going into standby automatically , cutting down GPU power by half , etc) . Real macs do have Electronic controller as well , its just that Apple made it to work with EFI and with their EC only , for the rest of us – we’re still using traditional ACPI Method. This is where both of the kexts come into play ! (more after the jump)

Enough of your long-winded text. So will it help me to fix noisy fan issues and stuff in OSX ?

I’ve conducted some tests in insanelywind and I’ve found out that it did in fact work for MSI Wind U100 netbooks. These fans are controlled automatically based on temperature of CPU and other components inside . However due to the “legacyness” of this kext , it does not report fan speed and such to OSX. Even if its possible to report , applications would not able to work such as iStat as it prefers to use SMC to obtain data rather then traditional ACPI Calls. Short-answer , yes !

So how do I go about installing …

Simple , just be sure that you’re running 32-bit kernel . To verify if you’re on 32-bit , simply fire up Terminal and type uname -a

You should see “i386” if you’re on 32-bit kernel and “x86_64” (64-bit kernel). If you’re on 64-bit kernel , be sure to use 32-bit kernel.

Now download the kexts , and place them in either your EFI Partition or /Extra/Extensions or /System/Library/Extensions. Its your call , these kexts will work anywhere regardless of where you place them. Fix the permissions , rebuild kext cache and reboot.

Keep your fingers crossed. Once you’re on OSX , you can check if the kexts are loaded by issuing kextstat or check in IORegistryExplorer. On some laptops you should able to see your current fan speed and other information. But for others , you dont get to see em as the system does not report. Nothing to fear , its just that it does it automagically without letting you know whats going on behind the hood :p

Oh yeah one more thing , this thing goes best with Superhai’s VodoooPowerMini . It may not work with Native SpeedStep via DSDT.

These are the primary reasons why I’ve recompiled the kext. The original source code can be obtained from Apple’s site. Modifications would be posted later as I need to have a cooling off period before I could release it

9 thoughts on “Legacy AppleACPIThermal & AppleACPIEC Kexts”

  1. I checked the information in Ioregistry explorer and AppleACPIThermal shows only one state^_^
    So i removed the kexts

  2. Hey there prasys!
    So I tried your kexts on both my HP Mini 1000 and HP Mini 311.
    For the Mini 1000, an ioregistry check revealed that the kexts are indeed loaded. Also I’m getting fan speed at a constant -714 rpm using your hacked iStat Pro and iStat Nano…I wonder if that’s gold I hit already?

  3. I don’t know if it’s powermanagement related issue but I’m having a progressive graphical slowdown since fresh login. I.e.:
    I boot Mac OS X, login and do a CINEBENCH R10 Opengl test getting 3740 ~ points, and I stay for a while (1-2 hours) using OpenGL apps (if I don’t use OpenGL apps the bug doesn’t appear) such as Google Earth and some games and then I close al apps and run another CINEBENCH R10 test and this time I’am getting only 2980 ~ points and if I continue opening OpenGL apps for another while the CINEBENCH R10 punctuation goes down to 2200 ~ and desktop graphics start getting laggy (the CPU punctuation stills the same all the time) I supose that after a day I would have 0 HW acceleration. Why is this happening???, my GPU is NVIDIA 8600M GS and I use EFI device-properties injection and MacBookPro5,2 SMC profile.

  4. hy mates! Is it possible to make these kexts with both 64 and 32 bits? Because I am running fully 64bit on SL and I would want to test them. Keep-up tha good work 😉

  5. Hi, I’ve installed Leopard 10.5.7 on my Toshiba laptop and I’m quite happy with the results.

    The problem is that I realized that sometimes the fan doesn’t seem to work at all, and it gets very hot and then shouts down.

    Installing these kexts would solve my problem? Are these files compatible with Leopard 10.5.7 ??

    Thanks in advance.-

  6. any chance you bring these to Leopard 10.5.x ?

    I would not risk to install kexts that could hose my otherwise fine running* toshiba L500 laptop 😉

    *except Intel Wifi 5100 and no QE/CI ( RadeonHD.kext )

Leave a Reply

Your email address will not be published. Required fields are marked *

CommentLuv badge