I got this silly problem when tried to start Compiz: the screen turned upside down :D
After days (!) of checking xserver config and compiz, it turns that I forgot to remove nvidia-current and nvidia-common driver after I switched my old motherboard to my new Intel chipset Motherboard (which have an onboard Intel 2nd generation VGA)
This simple command fixed my problem:
apt-get remove nvidia-current nvidia common
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