Hi Keng-Yu,
Here is the `cat /proc/bus/input/devices` output:
I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input6
U: Uniq=
H: Handlers=mouse0 event5
B: PROP=5
B: EV=b
B: KEY=e520 10000 0 0 0 0
B: ABS=660800011000003

I: Bus=0018 Vendor=06cb Product=75be Version=0100
N: Name="DLL0691:00 06CB:75BE UNKNOWN"
P: Phys=
S: 
Sysfs=/devices/pci0000:00/INT3433:00/i2c-8/i2c-DLL0691:00/0018:06CB:75BE.0001/input/input11
U: Uniq=
H: Handlers=mouse1 event10
B: PROP=1
B: EV=b
B: KEY=6420 10000 0 0 0 0
B: ABS=260800000000003

There are two events here corresponding to these two devices, event5 and 
event10.
evtest with event5 does not detect anything with touching, clicking and moving 
on the clickpad.
Please find the attachment for the single tapping on it with xevtest event10

** Attachment added: "event10.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux-lts-utopic/+bug/1439938/+attachment/4385229/+files/event10.txt

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https://bugs.launchpad.net/bugs/1439938

Title:
  [Dell Inspiron 7746] Tap to click does not work on the clickpad with
  14.04.2

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