SilverBridge
October 17th, 2009, 04:11 AM
i am running Ubuntu 9.04 on my Acer Extensa 4220 Laptop , dual boot with Windows Vista , i have the 3D desktop effects through compiz , whenever i press alt+tab , my Laptop freezes and i have to press my power button for like 5 seconds to shut it down and then turn it on , so any idea why this is happening ?