This is a generic issue and not tied with HP Pavilion dm3 Notebooks. Many notebook touchpads do not have a working edge scroll first time with Ubuntu. The key is to pass a option to the psmouse module.
See if psmouse is running. If not running check here
Do a ls. If no psmouse.ko is present then it has to be recompiled with latest kernel headers. I would not go into that.
Assuming psmouse is present. Then unload it by
Then inject the following line
sudo echo "options psmouse proto=imps" >> /etc/modprobe.d/psmouse.conf
It might give an error if the file is not present. Then
sudo echo "options psmouse proto=imps" > /etc/modprobe.d/psmouse.conf
Reload the psmouse module
The vertical scroll should work now.
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