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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Compare the info from /proc/bus/input/device before and after upgrade,
the 06cb:2985 device will be disappeared.

I: Bus=0018 Vendor=06cb Product=2985 Version=0100
N: Name="DLL0662:00 06CB:2985"
P: Phys=
S: Sysfs=/devices/pci0000:00/INT33C3:00/i2c-1/i2c-DLL0662:00/input/input7
U: Uniq=
H: Handlers=mouse0 event7 
B: PROP=5
B: EV=b
B: KEY=e520 10000 0 0 0 0
B: ABS=673800001000003

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https://bugs.launchpad.net/bugs/1436137

Title:
  Touchpad "DLL0662:00 06CB:2985" detected as a SynPS/2 Synaptics
  TouchPad an, making 3 / 4-finger gesture does not work after upgrade
  on 14.04.1

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  CID: 201404-14997 Dell Vostro 3546

  The touchpad was detected as "DLL0662:00 06CB:2985" on 14.04.1 stock image (3.13.0-32)
  And it works with three / four finger tapping gesture.

  But after upgraded to 3.13.0-48, it's detected as "SynPS/2 Synaptics TouchPad", therefore it can't do three / four finger tapping.
  (bug 1384042)

  ubuntu@201404-14997:~$ xinput list
  ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
  ⎜   ↳ SynPS/2 Synaptics 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)]
      ↳ Power Button                            	id=8	[slave  keyboard (3)]
      ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
      ↳ Integrated_Webcam_HD                    	id=10	[slave  keyboard (3)]
      ↳ AT Translated Set 2 keyboard            	id=11	[slave  keyboard (3)]
      ↳ Dell WMI hotkeys                        	id=13	[slave  keyboard (3)]

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-48-generic 3.13.0-48.80
  ProcVersionSignature: Ubuntu 3.13.0-48.80-generic 3.13.11-ckt16
  Uname: Linux 3.13.0-48-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ubuntu     1415 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu     1415 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Mar 24 22:11:26 2015
  HibernationDevice: RESUME=UUID=cb4a77a9-ee15-4ee5-b063-5c0b28a5d789
  InstallationDate: Installed on 2015-03-24 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Vostro 3546
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-48-generic root=UUID=7d45912a-8768-4c39-8ec0-43eec97c733d ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-48-generic N/A
   linux-backports-modules-3.13.0-48-generic  N/A
   linux-firmware                             1.127.11
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: yes
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/05/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 02R010
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A04
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd08/05/2014:svnDellInc.:pnVostro3546:pvrNotSpecified:rvnDellInc.:rn02R010:rvrA04:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Vostro 3546
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.

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