From the synaptics driver man page:
The perceived physical edges may be adjusted with the AreaLeftEdge, AreaRightEdge,
AreaTopEdge, and AreaBottomEdge options. If these values are set to something other than
the physical edges, input in the space between the area edge and the respective physical
edge is ignored. Note that this reduces the available space on the touchpad.
And that's exactly what we want, right? Therefore, we are going to have to come up with a value for
AreaBottomEdge, get the other three using
xinput, and write a custom
First of all, we need to find some information about our touchpad. In a terminal, run
xinput list. For me, the output looks like this:
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ PIXART USB OPTICAL MOUSE id=11 [slave pointer (2)]
⎜ ↳ ETPS/2 Elantech Touchpad id=14 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Power Button id=9 [slave keyboard (3)]
↳ Sleep Button id=10 [slave keyboard (3)]
↳ Chicony USB 2.0 Camera id=12 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
My touchpad is identified as
ETPS/2 Elantech Touchpad. Now we need to find out some information for creating the
xorg.conf later. Let's figure out what values the driver is currently using for the touchpad edges by running:
xinput list-props "ETPS/2 Elantech Touchpad"|grep Edges
which, for me, outputs:
Synaptics Edges (280): 97, 2339, 56, 988
Save these values for later.
Now, create a new file named
/etc/X11/xorg.conf if it doesn't already exist, open it using your favorite text editor as root, and put this in it, using the values we found earlier:
Option "AreaLeftEdge" "97" # the first value from "Synaptics Edges"
Option "AreaRightEdge" "2339" # the second value
Option "AreaTopEdge" "56" # the third value
Option "AreaBottomEdge" "988" # the fourth value - change this
Remember that, for best results when creating this file, you must use the values that you found yourself. Do not use mine. (I'm not calling you an idiot or anything; I'm just making sure so that you don't screw this up.)
Also, you are going to have to change the value for
AreaBottomEdge so that it is less than the original and meets your requirements. You are going to have to experiment with this until you are satisfied with the results.
Also remember to log out and log back in after saving the file for the changes to take effect.