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[Bug 1369684] Re: Elantech touchpad locks cursor when touching with 2 or more fingers


Thanks a lot for this! I don't have a device with me to test, so I'll test it next week.  I did a diff with the current elantech file for 3.13 and there are so many differences. It's for me not possible to tell which one solves the problem. I think it is based on an older version of the file.
I took the liberty to include Hans de Goede in this bug. He did all 2014 changes to the elantech driver in Ubuntu this year - I hope you don't mind Hans.

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  Elantech touchpad locks cursor when touching with 2 or more fingers

Status in The Linux Kernel:
Status in linux package in Ubuntu:

Bug description:
  Running Ubuntu 14.04.1, Unity desktop, kernel 3.13.0-35 generic on
  Intel Classmate, MG Pupil 109

  The touchpad is identified in dmesg as
  [    1.539535] mousedev: PS/2 mouse device common for all mice
  [    2.528608] psmouse serio4: elantech: assuming hardware version 3 (with firmware version 0x354f01)
  [    2.541184] psmouse serio4: elantech: Synaptics capabilities query result 0x39, 0x16, 0x09.

  The cursor locks when you touch the touchpad with 2 or more fingers.
  The only way I found to get it loose is reboot or suspend and resume.

  modprobe -r psmouse
  modprobe psmouse doesn' t work, also not with proto=auto  

  In systemsettings I disabled 2 finger scrolling without result

  In dmesg I see messages like "psmouse serio4: Touchpad at
  isa0060/serio4/input0 lost synchronization, throwing 5 bytes away
  during normal operation". The number of bytes can be 4 too. When the
  cursor locks up, I don't see such a message. Nothing is reported in

  Doing some research, I've learned that the touchpad should support
  multi touch. Off course that doesn't work, since touching the pad with
  more fingers makes it lock.

  Any help much appreciated.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic
  Uname: Linux 3.13.0-35-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
   /dev/snd/controlC0:  test       1474 F.... pulseaudio
  Date: Mon Sep 15 20:00:38 2014
  HibernationDevice: RESUME=UUID=6f2e0704-c6a4-4f89-b357-c8e46ff9d0ec
  InstallationDate: Installed on 2014-09-15 (0 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Intel Corporation Intel powered classmate PC
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic.efi.signed root=UUID=40917190-7ade-42d5-a5d2-91f8c497278e ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/21/2014
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: MPBYT10A.90A.0029.2014.0421.1908
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Intel powered classmate PC
  dmi.board.vendor: Intel Corporation
  dmi.board.version: Clamshell
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 11
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrMPBYT10A.90A.0029.2014.0421.1908:bd04/21/2014:svnIntelCorporation:pnIntelpoweredclassmatePC:pvrClamshell:rvnIntelCorporation:rnIntelpoweredclassmatePC:rvrClamshell:cvnIntelCorporation:ct11:cvr0.1:
  dmi.product.name: Intel powered classmate PC
  dmi.product.version: Clamshell
  dmi.sys.vendor: Intel Corporation

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