Legacy USB Support fix after upgrading from 10.8.3 to 10.8.5 Solved!

[xbsd]

Hi All,

I had some difficulty upgrading to 10.8.5 because my KVM (keyboard, mouse, monitor switcher box) requires older USB support, so after I upgraded the mouse and keyboard stopped working. So after I upgraded I booted to my backup disk, in the same computer that still had 10.8.3 on it, and tried Multi-beast with the Miscellaneous/USB 3.0 – Universal to fix the 10.8.5 disk, however that cause a hang before the login screen, finally the following fixed the problem.

A_HD is the name of my SSD with 10.8.3
B_HD is the name of my SSD with 10.8.5 which boots with a frozen mouse

These commands were executed from the terminal (the $ just means you have a prompt, in the terminal)
$ cd /Volumes/B_HD/System/Library/Extensions
$ sudo mkdir ../old_ext
$ sudo mv IOUSBFamily.kext ../old_ext
$ sudo cp -r /System/Library/Extensions/IOUSBFamily.kext .

Also note you can check the kext by;
$ cd IOUSBFamily.kext/Contents
$ cat INFO.plist
You should see something like;
<dict>
<key>com.apple.iokit.IOPCIFamily</key>
<string>2.6</string>
<key>com.apple.kpi.bsd</key>
<string>9.0.0</string>
<key>com.apple.kpi.iokit</key>
<string>9.0.0</string>
<key>com.apple.kpi.libkern</key>
<string>9.0.0</string>
<key>com.apple.kpi.mach</key>
<string>9.0.0</string>
<key>com.apple.kpi.unsupported</key>
<string>9.0.0</string>
</dict>

All seems to work fine now for the last few hours.

Cheers,
Scott

 

[xbsd]

Ok I should also note here that my LG external DVD burner stopped working after this change.
Why is mac OS 10.8.5 not compatible with older USB devices out of the box, if they rewrote the USB drivers why were they not checked for backward Compatibility?