The touchpad does not have any keys anymore. Clinking/tapping on it is a left click, clicking/tapping in the lower right corner is a right click, but I missed the middle click. I read that the middle click can be emulated by tapping with two fingers, but it did not work out of the box. After trying many things I found out the following:
- Tapping must be activated. There seems to be no way to emulate the middle click by clicking with two fingers. I previously deactivated tapping in the Ubuntu mouse settings, because it was annoying when typing. I re-activated it with xinput. For some reason, it is not as annoying anymore with this setting, because it is not as sensitive as it was with the default settings:
xinput set-prop "SynPS/2 Synaptics TouchPad" "Synaptics Tap Action" 2 3 0 0 1 2 3
- Enable tap to click (2 fingers for middle click, 3 fingers for right click):
synclient TapButton1=1 TapButton2=3 TapButton3=2
This works for once. Probably it needs to be persisted somehow to still work after a reboot.