thinkpad t400 opensuse 11.3 + KDE 4.5 = freeze

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http://forums.opensuse.org – Hi, I am running openSuSE 11.3 on a Thinkpad T400 laptop (with Intel+ATI switchable graphics). I made a clean install of openSuSE 11.3 (earlier running 11.2), and updated to KDE 4.5. Now my screen freezes frequently. I can move the mouse cursor all over the screen, but cannot start any application; the keyboard doesn't work too. The only way for me to get things to work is to logout and login again. Can anyone help me fix this? Thanks. (Distributions)