The same situation here as Arushi , I have an HP pavilion 14-ab042TX laptop.The 
touchpad supports basic functionalities like single click but no multitouch and 
two finger scroll.
I am using ubuntu 16.04 and kernel is 4.4.0-36-generic. The output of xinput is 
:

 Virtual core pointer                           id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ PS/2 Elantech Touchpad                    id=12   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Video Bus                                 id=8    [slave  keyboard (3)]
    ↳ Power Button                              id=9    [slave  keyboard (3)]
    ↳ HP Truevision HD                          id=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=11   [slave  keyboard (3)]
    ↳ HP WMI hotkeys                            id=13   [slave  keyboard (3)]
    ↳ HP Wireless hotkeys                       id=14   [slave  keyboard (3)]
When i do xinput list-props 12 , it shows:

Device 'PS/2 Elantech Touchpad':
        Device Enabled (168):   1
        Coordinate Transformation Matrix (170): 1.000000, 0.000000, 0.000000, 
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        Device Accel Profile (289):     0
        Device Accel Constant Deceleration (290):       1.000000
        Device Accel Adaptive Deceleration (291):       1.000000
        Device Accel Velocity Scaling (292):    10.000000
        Device Product ID (285):        2, 1
        Device Node (286):      "/dev/input/event6"
        Evdev Axis Inversion (293):     0, 0
        Evdev Axes Swap (295):  0
        Axis Labels (296):      "Rel X" (178), "Rel Y" (179)
        Button Labels (297):    "Button Left" (171), "Button Middle" (172), 
"Button Right" (173), "Button Wheel Up" (174), "Button Wheel Down" (175)
        Evdev Scrolling Distance (298): 0, 0, 0
        Evdev Middle Button Emulation (299):    0
        Evdev Middle Button Timeout (300):      50
        Evdev Third Button Emulation (301):     0
        Evdev Third Button Emulation Timeout (302):     1000
        Evdev Third Button Emulation Button (303):      3
        Evdev Third Button Emulation Threshold (304):   20
        Evdev Wheel Emulation (305):    0
        Evdev Wheel Emulation Axes (306):       0, 0, 4, 5
        Evdev Wheel Emulation Inertia (307):    10
        Evdev Wheel Emulation Timeout (308):    200
        Evdev Wheel Emulation Button (309):     4
        Evdev Drag Lock Buttons (310):  0
On doing dmesg | grep elantech gives:
[    3.547709] psmouse serio1: elantech: unknown hardware version, aborting...
This message is also displayed every time I boot ubuntu.

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https://bugs.launchpad.net/bugs/1166442

Title:
  Elantech clickpad/touchpad lacks multitouch features.

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Precise:
  Fix Released
Status in linux source package in Quantal:
  Fix Released
Status in linux source package in Raring:
  Fix Released
Status in linux source package in Saucy:
  Fix Released
Status in linux package in Arch Linux:
  New

Bug description:
  Newer versions of the Elantech multitouch trackpad are not fully
  supported in Linux.  These appear in many of the newer Samsung
  laptops, for example.  elantech.c in the kernel needs to be updated to
  support these models (up to v7 perhaps?)

  This bug is confirmed to affect a range of samsung laptops running
  Ubuntu 12.04 and newer, ArchLinux, Fedora and also affects the current
  (3.9) upstream kernel.

  A dkms package was produced in 2011 (see
  https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
  intel/+bug/681904/comments/64) which may fix certain older laptops
  affected by this issue, but doesn't fix newer models.

  == Original Report ==

  Hello,

  So far I've been having a problem with my Elantech multitouch trackpad in 
Linux. Basically all i get is right click, left click, and tap to click, along 
with basic  movement. The problem seems to be rooted in improper detection of 
the trackpad, likely b/c its a new revision or whatnot. Of note is that working 
elantech trackpads of the past in forums i scouted through show up as "ETPS/2 
Elantech Touchpad". Mine just shows up in xinput as "PS/2 Elantech Touchpad". I 
think this might be a simple fix in the end, just improper detection, I hope. 
For reference, I've tried kernel 3.5 on Ubuntu 12.10 and kernel 3.8.0-17 on 
Ubuntu 13.04 thus far, with all combinations of psmouse.
  
------------------------------------------------------------------------------------------
  What's expected: touchpad multitouch support
  What happened: basic touchpad support
  Laptop mode: Samsung Series 7 NP780 series
  Ubuntu distro(s) tested: Ubuntu 12.10, Ubuntu 13.04
  Kernels used: 3.5 signed (Ubuntu 12.10 default), 3.8.0-16, 3.8.0-17 signed
  Other tests: Attempted using psmouse-elantech-v6, psmouse-alps, and 
psmouse-alps-dst. No improvements so removed.

  synclient -l reports "Couldn't find synaptics properties. No synaptics driver 
loaded?"
  
------------------------------------------------------------------------------------------
  See attached for more info. Ask anything you need!
  ---
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  gscoppino   2272 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=f683852c-7aa0-4f32-8b86-56f0a018989d
  InstallationDate: Installed on 2013-04-06 (3 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 770Z5E/780Z5E/870Z5E/880Z5E
  MarkForUpload: True
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-17-generic.efi.signed 
root=UUID=cf39fbe5-c8ff-4d16-b11e-a41a4f3ae955 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-17.27-generic 3.8.6
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-17-generic N/A
   linux-backports-modules-3.8.0-17-generic  N/A
   linux-firmware                            1.104
  StagingDrivers: rts5139
  Tags:  raring staging
  Uname: Linux 3.8.0-17-generic x86_64
  UpgradeStatus: Upgraded to raring on 2013-04-06 (3 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 02/26/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P03ABU.139.130226.SK
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP780Z5E-S01UB
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SEC_SW_REVISION_1234567890ABCD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP03ABU.139.130226.SK:bd02/26/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn770Z5E/780Z5E/870Z5E/880Z5E:pvrP03ABU:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP780Z5E-S01UB:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 770Z5E/780Z5E/870Z5E/880Z5E
  dmi.product.version: P03ABU
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
  ---
  ApportVersion: 2.9.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  gscoppino   2272 F.... pulseaudio
  DistroRelease: Ubuntu 13.04
  HibernationDevice: RESUME=UUID=f683852c-7aa0-4f32-8b86-56f0a018989d
  InstallationDate: Installed on 2013-04-06 (3 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 770Z5E/780Z5E/870Z5E/880Z5E
  MarkForUpload: True
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-17-generic.efi.signed 
root=UUID=cf39fbe5-c8ff-4d16-b11e-a41a4f3ae955 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-17.27-generic 3.8.6
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-17-generic N/A
   linux-backports-modules-3.8.0-17-generic  N/A
   linux-firmware                            1.104
  StagingDrivers: rts5139
  Tags:  raring staging
  Uname: Linux 3.8.0-17-generic x86_64
  UpgradeStatus: Upgraded to raring on 2013-04-06 (3 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 02/26/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P03ABU.139.130226.SK
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: NP780Z5E-S01UB
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SEC_SW_REVISION_1234567890ABCD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP03ABU.139.130226.SK:bd02/26/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn770Z5E/780Z5E/870Z5E/880Z5E:pvrP03ABU:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP780Z5E-S01UB:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 770Z5E/780Z5E/870Z5E/880Z5E
  dmi.product.version: P03ABU
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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