Comment # 7 on bug 1137750 from Frank Kruger

(In reply to Hubert Mantel from comment #6)
> (In reply to Frank Kruger from comment #5)
> > For the time being, do you have xf86-input-synaptics installed? If not, give
> > it a try.
> 
> Bingo! But it was the other way around: xf86-input-synaptics (which seems to
> be obsolete), was installed. So I just removed the configuration file
> /etc/X11/xorg.conf.d/70-synaptics.conf and now it works. Maybe the whole
> issue was caused because this was an update. Not sure if the driver would
> also have been installed by a fresh installation.
> 
> So feel free to resolve this one as FIXED, WORKSFORME or even INVALID.

The expert should decide (cc Stefan Dirsch).