Guide on how to get this working on Mojave (Couldn't open IO Service)

[coworo]

10.14.6 on MBA 2017, SIP is disabled.

sudo ./voltageshift mon and info results in no output.

sudo ./voltageshift loadkext results in "Couldn't open IO Service"

tried voltageshift versions 10.12-14, 1.24, 1.25

Not sure where to go from here.

sudo csrutil status
System Integrity Protection status: disabled.

sudo kextutil VoltageShift.kext/
Kext rejected due to improper filesystem permissions: <OSKext 0x7fdb13c2fc70 [0x7fff962c5920]> { URL = "file:///Users/AAA/Downloads/voltageshift_1.25(1)/VoltageShift.kext/", ID = "com.sicreative.VoltageShift" }
Code Signing Failure: code signature is invalid
Authentication Failures: 
    File owner/permissions are incorrect (must be root:wheel, nonwritable by group/other): 
        /Users/AAA/Downloads/voltageshift_1.25(1)/VoltageShift.kext
        Contents
        _CodeSignature
        CodeResources
        MacOS
        VoltageShift
        Resources
        en.lproj
        InfoPlist.strings
        Info.plist

Warnings: 
    Personality has no CFBundleIdentifier; the kext's identifier will be inserted when sending to the IOCatalogue: 
        VoltageShiftAnVMSR

Diagnostics for /Users/AAA/Downloads/voltageshift_1.25(1)/VoltageShift.kext:
Authentication Failures: 
    File owner/permissions are incorrect (must be root:wheel, nonwritable by group/other): 
        /Users/AAA/Downloads/voltageshift_1.25(1)/VoltageShift.kext
        Contents
        _CodeSignature
        CodeResources
        MacOS
        VoltageShift
        Resources
        en.lproj
        InfoPlist.strings
        Info.plist

Warnings: 
    Personality has no CFBundleIdentifier; the kext's identifier will be inserted when sending to the IOCatalogue: 
        VoltageShiftAnVMSR

[coworo]

This is how i solved it :

You probably already tried a lot of things so to start from a clean slate :

• run

sudo kextcache -clear-staging /
sudo kextcache -invalidate /

• Delete these folders and files (if they exist)

/System/Library/Extensions/VoltageShift.kext
/Library/Extensions/VoltageShift.kext
/Library/Application Support/VoltageShift
/Library/LaunchDaemons/com.sicreative.VoltageShift.plist

• run again

sudo kextcache -clear-staging /
sudo kextcache -invalidate /

• run

kextstat | grep -v apple

to confirm theres nothing related to voltageshift there.

How to actually install it :

• run in recovery*****

csrutil enable --without kext or csrutil disable
spctl kext-consent disable

• download

voltageshift_10.12-14 from https://sitechprog.blogspot.com/2017/06/voltageshift.html
or
voltageshift_1.2 from sicreative's post on #31

(difference is 10.12-14 has a bug fix that allows you to set PL on boot afaik)

• navigate to the folder you downloaded and run

sudo chown -R root:wheel VoltageShift.kext/

most likely unnecessary if you dont want to use voltage shift from anywhere in the command line but im just sticking to exact steps i took here;

sudo cp voltageshift /usr/local/bin
sudo cp -r VoltageShift.kext /Library/Extensions/
sudo chown -R root:wheel /Library/Extensions/VoltageShift.kext

• open a new terminal (or cd out of voltageshift folder)

voltageshift info to test
voltageshift info to test again to confirm you didnt ran into the weird behaviour i had where the kext would unload after every usage of voltage shift and wouldnt reload again.

• do the thing you want to do

Example :

sudo voltageshift buildlaunchd 0 0 0 0 0 0 0 20 15 60

Sets PL1 : 20 PL2 : 15 Disables Turbo Boost applies on boot refreshes every 60 minutes .

***** Isnt disabling all that kind of overkill?

It kinda is, a better option could be running spctl kext-consent add 7698T37TAB in recovery mode again to approve the team identifier of this kext. You probably wouldnt even need to disable SIP but im not sure and i dont want to test because im sick of troubleshooting.

[eduardmolnar]

Confirmed working on macOS Catalina 10.15 too. Thank you very much for the info! Seems like the invalid permissions were the biggest problem.