D'oh! Thanks to your question (and knowing that it worked for a
similar system), while simplifying my config file in order to post, I
tracked down exactly what the problem was. Now I'm a little
embarassed that I'd let this bother me for so long!
In the InputDevice section for "synaptics", this line was responsible:
Option "CircScrollDelta" "0.001"
I can't say whether this was related to the upgrade to xorg or to a
new version of the synaptics driver or what, but somewhere the
behaviour changed. The driver's changelog doesn't document this, but
everything seems to be working when I just remove the line.
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Ben Pearre http://hebb.mit.edu/~ben PGP: CFDA6CDA
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