Ubuntu – Enable Edge Scrolling – Ubuntu 14

Unfortunately I have never found a reliable GUI for configuring such a thing. You'd have to use command line to alter the settings. It's a very ugly and hairy route.

This isn't what you're asking but here's a script I use on my own Acer Aspire. Perhaps you can use it:

#!/bin/sh

sleep 5
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Pressure" 32 10
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Width" 32 8
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Two-Finger Scrolling" 8 1
xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Two-Finger Scrolling" 8 1 1
xinput set-prop "SynPS/2 Synaptics TouchPad" "Synaptics Edge Scrolling" 0 0 0

If you make a .sh file, mark it as executable and set it to run on startup then you will have disabled edge scrolling and instead have fairly decent two-finger scrolling.

I do not know of any method to change the threshold, unfortunately. I have looked around many times for such settings. Xorg is severely limited in these areas, unfortunately.

The challenge you are facing is likely caused by the fact that while many touchpads enable horizontal scrolling, they often do not have a large enough area for the scrolling to actually be detected. There used to be a program for changing this value, but I don't think it is supported any longer.

Of course, that is only one possible explanation, and it may just be that your touchpad doesn't support it in the first place, which is more likely the problem.

EDIT: From the information you gave, it would seem that either the driver in Linux is missing support for horizontal scrolling, or it is using the wrong configuration for your hardware. In either case, you should report a bug.