PS2 doesn't work after 10.5.2 update

this is another thing that didn't work for me after updating to 10.5.2 on several computers, and several installations including laptop trackpad,

the solution is fairly easy, you need to restore your ApplePS2Controller and AppleACPIPlatform kext (Kernel Extensions).

so the first thing you need to have is the 10.5.1 kext here are links (in case you didn't back it up):
AppleACPIPlatform.kext
ApplePS2Controller.kext

the way to restore them is from the command line:

1. open terminal and write these commands:
2. sudo -s (press enter and write your password and press enter again)
3. mv /System/Library/Extensions/ApplePS2Controller.kext /System/Library/Extensions/ApplePS2Controller.kext.10.5.2
4. mv /Extensions/AppleACPIPlatform.kext /Extensions/AppleACPIPlatform.kext.10.5.2
5. these commands will backup your current 10.5.2 kext, just in case
6. next copy the 10.5.1 kext and set their premissions like this:
7. cp -R /ExtensionsBackup/ApplePS2Controller.kext /System/Library/Extensions
8. chmod -R 755 /Extensions/ApplePS2Controller.kext
9. chown -R 0:0 /Extensions/ApplePS2Controller.kext
10. cp -R /ExtensionsBackup/AppleACPIPlatform.kext /System/Library/Extensions
11. chmod -R 755 /System/Library/Extensions/AppleACPIPlatform.kext
12. chown -R 0:0 /System/Library/Extensions/AppleACPIPlatform.kext
13. Reboot

that's it, if you are suffering from any problem please post comments on this post.

Enjoy.