Hi I can confirm that the new upstream version 1.1.3 of xf86-input-synaptics (aka xserver-xorg-input-synaptics) indeed fixes the vertical scrolling reliably on my Acer Aspire One 110L, alternatively the upstream backport of http://bugs.freedesktop.org/attachment.cgi?id=28026 (referred to from http://bugs.freedesktop.org/show_bug.cgi?id=21001) works just as well.
Regards
Stefan Lippers-Hollmann
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