Acer Aspire S7-392-9890

Acer Aspire S7-392-9890 13.3-Inch Touchscreen Ultrabook (Intel Core i7-4500U Processor, 8GB DDR3L, 256GB SSD)

If like me you recently bought a new computer with an Elantech touchpad, and installed Ubuntu on it, chances are your touchpad lacks the multitouch features, and therefore, you can’t scroll with it. This is extremely annoying to most of us. Tonight, I went back to Ubuntu bug page to realize someone has submitted a fix, and it seems to be working for many users. Just tried it on my Acer Aspire S7, and it worked perfectly for me too. So let me share it with you…

Make sure you have an Elantech touchpad

First, if you aren’t sure your computer was built with an Elantech touchpad, open a terminal, and type the following:

cat /proc/bus/input/devices

You should find a block containing a line looking like this one, which confirms you are on an Elantech touchpad:

N: Name="ETPS/2 Elantech Touchpad"

Fix the bug

Download this archive (from Ubuntu’s bug reporting page).

Open a terminal, and follow these steps (after step 4, you will have no mouse at all):

cd ~/Downloads
sudo dkms ldtarball psmouse-elantech-x551c.tar.gz
sudo dkms install -m psmouse -v elantech-x551c
sudo rmmod psmouse
sudo modprobe psmouse

Enjoy multitouch!

Source: Original bug discussion on Launchpad