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[nicobrainless <1272777@xxxxxxxxxxxxxxxxxx>]

Just in case someone experience the same issue than me (or probably same than Dave earlier too), i.e. the touchpad is recognized by the new kernel, but then stops working again...
I installed 3.16-1 and the problem persisted.
However, I just realized that I still had some psmouse dkms module installed from a previous try at fixing the issue.

I just ran:
<quote> sudo dkms remove -m psmouse -v elantech-x551c --all 
sudo rmmod psmouse
sudo modprobe psmouse</quote>
And the scrolling is miraculously back!

Let's just hope it persists after reboot.
No one else has complained in a while... maybe this bug should be tagged as fixed?

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https://bugs.launchpad.net/bugs/1272777

Title:
  Elantech touchpads not fully supported for some Gigabyte laptops

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  This bug report is in addition to
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1166442 - the
  fixes suggested there (which work for others) have been tried but do
  not work for a small subset of laptops, particularly the Gigabyte
  U2442 series.

  Description of the situation for my Gigabyte U2442V most recently
  running 3.11.0-12-generic on Linux Mint.

  I tried the updated module mentioned in the above bug report (1166442). It compiles and it detects an Elantech trackpad of *indeterminate version*.  I get this in dmesg:
  [859697.496141] psmouse serio1: elantech: assuming hardware version 3 (with firmware version 0x450f01)
  [859697.526011] psmouse serio1: elantech: Synaptics capabilities query result 0x58, 0x17, 0x0c.
  [859697.765917] psmouse serio1: elantech: retrying ps2 command 0x0b (2).
  [859698.470556] psmouse serio1: elantech: retrying ps2 command 0x0b (1).

  I get no Synaptics driver functionality, and only basic touchpad
  behaviour (motion and tap-to-click for left click, no scroll or
  disabling the pad when typing, etc.).

  It seems I don't have a v9 or v10 trackpad, I've never been able to
  get a definitive indication of which version I have got.

  The only thing that has remedied this problem for me in the past was
  the one described in the original bug report (for elantech-v6 -
  https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-
  intel/+bug/681904/comments/64)... but it no longer applies to newer
  kernels...

  With the 3.11.0-12-generic kernel, my Touchpad *is* detected, i.e. xinput shows:
    ↳ PS/2 Elantech Touchpad id=16 [slave pointer (2)]
  and dmesg shows:
   input: PS/2 Elantech Touchpad as /devices/platform/i8042/serio1/input/input14

  There are no useful touchpads settings evident in the normal Cinnamon
  settings utility (gnome-control-center -> Mouse & Touchpads).  I see a
  touchpad settings option with the "gpointing-device-settings" app and
  I can turn on vertical and horizontal scrolling in the interface, but
  doing so does not in any way affect that actual touchpad behaviour.

  I've also tried installing the elantech-v7 module via dkms (see http://ubuntuforums.org/showthread.php?t=2111236&p=12850603#post12850603) and it compiles, but it too fails to provide the desired functionality.
  --- 
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  DistroRelease: Ubuntu 13.10
  HibernationDevice: RESUME=UUID=29b0358f-f728-4aea-bce5-e233816f27b1
  InstallationDate: Installed on 2013-12-11 (46 days ago)
  InstallationMedia: Linux Mint 16 "petra" - Release amd64 20131126
  MachineType: GIGABYTE U2442
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic root=UUID=83fd94b8-53eb-4e68-9eeb-cf2e017cbe0d ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  petra
  Uname: Linux 3.11.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 10/26/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: U2442.F306
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: U2442
  dmi.board.vendor: GIGABYTE
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 10
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrU2442.F306:bd10/26/2012:svnGIGABYTE:pnU2442:pvrTobefilledbyO.E.M.:rvnGIGABYTE:rnU2442:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct10:cvrToBeFilledByO.E.M.:
  dmi.product.name: U2442
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: GIGABYTE

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