Can't recognize three,four or five fingers on Archlinux xfce4?

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I've installed touchegg 1.1.1-3 from AUR,but three fingers gesture aren't 
recognized.Then i ran touchegg from terminal.When i taped my touchpad with 
three or four fingers,it seems that only one finger was recognized.
The outputs:
[+] New gesture: 
    Type      ->  "DRAG" 
    Fingers   ->  1 
    Direction ->  "DOWN" 
    Action    ->  "DRAG_AND_DROP" 
    App Class ->  "Xfce4-terminal" 
    Gesture Start 
    Gesture Update 0 "Drag" 
    Gesture Update 0 "Drag" 
    Gesture Update 0 "Drag" 
    Gesture Finish 

With two fingers tapped the outputs is:
[+] New gesture: 
    Type      ->  "TAP" 
    Fingers   ->  2 
    Direction ->  "NO_DIRECTION" 
    Action    ->  "SEND_KEYS" 
    App Class ->  "Xfce4-terminal" 
    Gesture Start 
    Gesture Update 
    Gesture Finish 

I'm using evdev driver and here is /etc/X11/xorg.conf.d/10-evdev.conf:
Section "InputClass"
    Identifier "Evdev Touchpads"
    Driver "evdev"
    MatchIsTouchpad "on"
    MatchDevicePath "/dev/input/event*"
EndSection

I've attached my touchegg.conf below:

Original issue reported on code.google.com by qizhih...@gmail.com on 12 Dec 2014 at 10:52

Attachments:

• touchegg.conf

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Add:
Now i am using synaptics driver compiled from this:
https://github.com/zezadas/synaptics-multitouch_arch-linux
Two fingers' gesture works well,but three or more still not work.When i run 
touchegg from the terminal,it has no reaction to three fingers tap,and no 
outputs in terminal.
The command 'xinput list-props "ETPS/2 Elantech Touchpad" | grep Capabilities' 
outputs:
Synaptics Capabilities (313):   1, 0, 1, 1, 1, 1, 1
I think my touchpad supports multitouch,so i can't wait to try it when i know 
touchegg.And i really hope for your help.Sorry for my bad English.:-)

Original comment by qizhih...@gmail.com on 13 Dec 2014 at 5:06