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[Franz Hsieh <franz.hsieh@xxxxxxxxxxxxx>]

@Rober,

I think they are different.

I found there is a solution that can fix the issue.

https://wiki.archlinux.org/index.php/Touchpad_Synaptics#Xorg.log.0_shows_SynPS.2F2_Synaptics_touchpad_can_not_grab_event_device.2C_errno.3D16

I have add GrabEventDevice=0 option to xorg.conf and it works fine now.
Mouse cursor now can move after session is changed.


** Changed in: oem-priority
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1399096

Title:
  Touchpad lost function after switch from guest to user account

Status in OEM Priority Project:
  Confirmed
Status in unity-greeter package in Ubuntu:
  New

Bug description:
  Reproduce steps:
    1) Change account to guest by click guest account on the menu.
    2) Change account to user again
    3) Touchpad lost its function.

  When the touchpad becomes malfunction, there are some messages in
  /var/log/Xorg.0.log

  [   282.908] (WW) synaptics: SynPS/2 Synaptics TouchPad: can't grab event device, errno=16
  [   282.940] [dix] couldn't enable device 11
  [   282.940] setversion 1.4 failed: Permission denied

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-input-synaptics 1.7.4-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-41.69stella1-generic 3.13.11.10
  Uname: Linux 3.13.0-41-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Dec  4 02:25:41 2014
  DistUpgraded: Fresh install
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-stella-neihu-trusty-amd64-20141125-0
  DistroCodename: trusty
  DistroVariant: ubuntu
  InstallationDate: Installed on 2014-12-04 (0 days ago)
  InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20141125-01:45
  Lsusb:
   Bus 001 Device 003: ID 0bda:5776 Realtek Semiconductor Corp. 
   Bus 001 Device 002: ID 8087:8000 Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Hewlett-Packard HP 15 Notebook PC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-41-generic root=UUID=f7c1e040-6471-4e14-9e77-bb406b63fad3 ro quiet splash video.use_native_backlight=1 radeon.modeset=0 nouveau.modeset=0 vt.handoff=7
  SourcePackage: xserver-xorg-input-synaptics
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/28/2014
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.32
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 2211
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 86.45
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnInsyde:bvrF.32:bd10/28/2014:svnHewlett-Packard:pnHP15NotebookPC:pvr097F120000005F00001620100:rvnHewlett-Packard:rn2211:rvr86.45:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: HP 15 Notebook PC
  dmi.product.version: 097F120000005F00001620100
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.1stella3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Thu Dec  4 02:21:16 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               17900 
   vendor                                     AUO
  xserver.version: 2:1.15.1-0ubuntu2

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