you dont need to do leopard graphics update...i have the GMA950 and i have solved the mouse artifacts and tearing issue by doing this:
1) Download the GMA950.zip file from the link below and extract the GMA950 folder to Desktop.
Забрать2) Go to the Applications folder, then Utilities, then open up Terminal
3) In Terminal, type the following commands
sudo su (then enter your password)
rm -R /system/Library/Extensions/AppleIntelIntegratedFramebuffer.kext
cp -R /Users/-user-/Desktop/GMA950/AppleIntelIntegratedFramebuffer.kext /System/Library/Extensions/
cp -R /Users/-user-/Desktop/GMA950/Natit.kext /System/Library/Extensions/
chmod -R 755 /system/library/extensions/AppleIntelIntegratedFramebuffer.kext
chown -R root:wheel /system/library/extensions/AppleIntelIntegratedFramebuffer.kext
chmod -R 755 /system/library/extensions/Natit.kext
chown -R root:wheel /system/library/extensions/Natit.kext
kextcache -k /System/Library/Extensions
diskutil repairPermissions /
4) after terminal has finished repairing disk permissions, close terminal and reboot computer