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[Martin Janiczek <1429446@xxxxxxxxxxxxxxxxxx>]

Tested these versions:
v4.0-rc3
v4.0-rc2
v4.0-rc1
v3.19.1

All the v4 versions kept crashing (didn't boot into X) on "Floating
point exception" related (at least seeing "synaptics_drv" in the
backtrace) to the touchpad - see the uploaded Xorg.failsafe.log from
v4.0-rc1.

In v3.19.1:
- the touchpad works (gestures!)
- xinput says:
⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
⎜   ↳ AlpsPS/2 ALPS DualPoint TouchPad        	id=11	[slave  pointer  (2)]
⎜   ↳ DualPoint Stick                         	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)]
    ↳ Integrated Camera                       	id=9	[slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard            	id=10	[slave  keyboard (3)]
    ↳ ThinkPad Extra Buttons                  	id=13	[slave  keyboard (3)]
- GPointing Device Settings shows both the stick and the touchpad
- Mouse and Touchpad also shows them both
- running `synclient` shows me config and not the error message

So far, from trying things out, it seems to work nice.
Will do the tagging you described.

Do you want me to upload some more logs, outputs etc?

** Attachment added: "Xorg.failsafe.log"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1429446/+attachment/4339361/+files/Xorg.failsafe.log

** Tags added: kernel-fixed-upstream kernel-fixed-upstream-3.19.1

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1429446

Title:
  Touchpad incorrectly recognized as PS/2 mouse in 'Lenovo ThinkPad
  20DF004SMC'

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Touchpad seen as a PS/2 mouse
  - no gestures etc. work
  - synclient says "Couldn't find synaptics properties. No synaptics driver loaded?"
  - in "Mouse and Touchpad" settings the only device is "PS/2 Generic Mouse"
  - in "Pointing devices" also.

  System info:
  - Manufacturer: LENOVO
  - Product Name: 20DF004SMC
  - Version: ThinkPad E550
  - SKU Number: LENOVO_MT_20DF_BU_Think_FM_ThinkPad E550
  - Family: ThinkPad E550

  - System release: Xubuntu 14.10
  - Linux version: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
  - xserver-xorg-input-synaptics: 1.8.1-1ubuntu1

  Various logs and diagnostics in attachment.
  Please let me know if I can help with anything.
  --- 
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  martin     2231 F.... pulseaudio
   /dev/snd/controlC1:  martin     2231 F.... pulseaudio
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=8cc5836e-0d84-4d5c-9c7b-b25cecb6dd1e
  InstallationDate: Installed on 2015-03-05 (2 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20DF004SMC
  NonfreeKernelModules: fglrx
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-31-generic.efi.signed root=UUID=3fcadb61-bad7-4dfa-bf5f-ba6ef49cc31a ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-31.41-generic 3.16.7-ckt5
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-31-generic N/A
   linux-backports-modules-3.16.0-31-generic  N/A
   linux-firmware                             1.138.1
  Tags:  utopic
  Uname: Linux 3.16.0-31-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare scanner sudo tape video
  _MarkForUpload: True
  dmi.bios.date: 01/22/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: J5ET42WW (1.13 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20DF004SMC
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJ5ET42WW(1.13):bd01/22/2015:svnLENOVO:pn20DF004SMC:pvrThinkPadE550:rvnLENOVO:rn20DF004SMC:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20DF004SMC
  dmi.product.version: ThinkPad E550
  dmi.sys.vendor: LENOVO

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