Whenever I try to do anything involving Sax2, my XWindows stop working. The only way back is to restore the backup of xorg.conf. This happened when I tried to use Sax2 for a change to the keyboard setup.
I’ve got 32-bit 11.0 on a Dell Latitude D830 with an NVidia graphics card. I’m using the NVidia drivers supplied via the NVidia one-click thingy.
In my experience, Sax2 is best avoided when using an NVIDIA card, especially with two monitors (as I have). Edit xorg.conf directly using a text editor if you know what you’re doing, or use nvidia-settings.