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[MrRomanze <mrromanze@xxxxxxxxx>]

1) No idea, I haven't tested it on older releases. BUT, it happens on 16.04!
2) No impact.

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

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https://bugs.launchpad.net/bugs/1538205

Title:
  Touchpad lock button locks mouse completely on Acer Aspire 7540

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Then I click touchpad lock button, it works, button glows, notification shows up, mouse locks. 
  However, then I press it again, it wouldn't unlock the touchpad. (but button stops to glow and notifications shows up again too) 
  The only solution is to reboot.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-25-lowlatency 4.2.0-25.30
  ProcVersionSignature: Ubuntu 4.2.0-25.30-lowlatency 4.2.6
  Uname: Linux 4.2.0-25-lowlatency x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  potato     2548 F.... pulseaudio
   /dev/snd/controlC1:  potato     2548 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Jan 26 20:29:28 2016
  HibernationDevice: RESUME=UUID=2277e00a-0411-4136-b180-2892752df2e0
  InstallationDate: Installed on 2016-01-17 (9 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Acer Aspire 7540
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-25-lowlatency root=UUID=ae6c8d51-38da-4c25-9281-6b9ceac5b2ca ro quiet splash acpi_sleep=nonvs quiet splash acpi_sleep=nonvs vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-25-lowlatency N/A
   linux-backports-modules-4.2.0-25-lowlatency  N/A
   linux-firmware                               1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Нет такого файла или каталога: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/07/2009
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.11
  dmi.board.name: JV71TR
  dmi.board.vendor: Acer
  dmi.board.version: Rev
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.11:bd12/07/2009:svnAcer:pnAspire7540:pvr0100:rvnAcer:rnJV71TR:rvrRev:cvnAcer:ct10:cvrNone:
  dmi.product.name: Aspire 7540
  dmi.product.version: 0100
  dmi.sys.vendor: Acer

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