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Install Snow Leopard on new MacBook Air?

Since this comes with Lion installed, is it possible to downgrade to Snow Leopard? Is there anything that would prohibit me from booting up with a Snow Leopard disk?

Posted on Jul 20, 2011 9:11 AM

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55 replies

Mar 8, 2013 9:18 AM in response to SansPareil

AppleUSBMultitouch.kext was already installed on my system, but as soon as I installed AppleUSBTopCase.kext, the keyboard started to work normally : good shot ! 🙂


I prefer not installing IOUSBFamily.kext 4.5.8 though : last time I changed this one, I got a unbootable system... did it allow you to have the trackpad functionning ?

Mar 12, 2013 12:37 PM in response to Celeri

I sought in detail...


With IORegistryExplorer and 10.7 here:


IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/EHC2@1A,7/AppleUSBEHCI/Ap ple Internal Keyboard / Trackpad@fa120000/Touchpad@2/AppleUSBTCButtons/IOHIDInterface/IOHIDEventDriver/ IOHIDPointing/IOHIDSystem/IOHIDStackShotUserClient


IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/EHC2@1A,7/AppleUSBEHCI/Ap ple Internal Keyboard / Trackpad@fa120000/Touchpad@1/AppleUSBMultitouchDriver/IOHIDInterface/AppleUSBMu ltitouchHIDEventDriver/IOHIDSystem/IOHIDStackShotUserClient


IOHIDStackShotUserClient run with 10.7 but not in IORegistryExplorer with 10.6


I tried other IOHIDFamily.kext (and combinaisons) without success for instance

Mar 13, 2013 5:13 PM in response to SansPareil

SansPareil wrote:


Also Lion doesn't support Rosetta: strategic error from apple


As I wrote in another context about accessing PowerPC apps in Lion or Mt. Lion:



Unfortunately you got caught up in the minor miracle of Rosetta. Originally licensed by Apple when it migrated from the PowerPC CPU platform that it had used from the mid-1990's until the Intel CPU platform in 2006, Rosetta allowed Mac users to continue to use their library of PPC software transparently in emulation.


However, Apple's license to continue to use this technology expired with new releases of OS X commencing with Lion (and now Mountain Lion). While educational efforts have been made over the last 6 years, the fact is that Rosetta was SO successful that many users were caught unaware UNTIL they upgraded to Lion or Mountain Lion.


Workarounds:


1. If your Mac will support it, restore OS X Snow Leopard;


2. If your Mac will support it, partition your hard drive or add an external hard drive and install Snow Leopard into it and use the "dual-boot" method to choose between your PowerPC software or Lion/Mt. Lion;


3. Upgrade your software to Intel compatible versions if they are available, or find alternative software that will open your data files, modify them and save them;


4. Install Snow Leopard Server (with Rosetta) into Parallels or VMWare Fusion for concurrent use of your PowerPC application with Lion or Mt. Lion:


User uploaded file

[click on image to enlarge]


Apple has now restarted to sell Snow Leopard Server at a 95% discount over its original price: only $19.99 + sales tax & shipping; telephone orders only, call 800-MYAPPLE (800-692-7753) - Apple Part Number: MC588Z/A


NOTE: Computer games with complex, 3D or fast motion graphics may not work well or at all in virtualization.


Install Snow Leopard on new MacBook Air?

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