1. If you can't fix these problems, you should ask yourself why you're running testing, and consider stable instead. Do you even need xorg? 2. The synaptics driver is in xfree86-driver-synaptics or xorg-driver-synaptics. It is used for a synaptics touchpad, commonly found on laptops.
Well, I can't fix these problems. And I can't get back to XFree86 either.So I'm stuck with the problem for now. I believe it's come down to WDM not playing well with Xorg more than anything else. XDM works OK where WDM crashes consistently.