Public bug reported:

HP Elitebook 8770w. Mouse left/right click & scroll wheel works only on
system panels (Window menus, choosing application, shutdown etc.), not
anywhere else. Reboot fixes problem, but it reappears after unknown time
period (usually overnight).

This problem is the same with touchpad buttons & external usb mouse.
Replugging mouse does not help.

I chose xorg package because this was instructed on older similar bugs.

Ubuntu 14.04.4 LTS 64bit, all upgrades

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8.1
ProcVersionSignature: Ubuntu 3.13.0-45.74-generic 3.13.11-ckt13
Uname: Linux 3.13.0-45-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  352.63  Sat Nov  7 21:25:42 
PST 2015
 GCC version:  gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04)
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Mar  8 06:51:26 2016
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
EcryptfsInUse: Yes
GraphicsCard:
 NVIDIA Corporation GK104GLM [Quadro K4000M] [10de:11bd] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:176c]
InstallationDate: Installed on 2014-07-17 (599 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Hewlett-Packard HP EliteBook 8770w
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-45-generic 
root=UUID=56df02cb-50ae-47b0-a07e-c197445ca7cd ro quiet splash
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/15/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68IAV Ver. F.06
dmi.board.name: 176C
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 50.19
dmi.chassis.asset.tag: CNU2429YXD
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68IAVVer.F.06:bd08/15/2012:svnHewlett-Packard:pnHPEliteBook8770w:pvrA1009D11:rvnHewlett-Packard:rn176C:rvrKBCVersion50.19:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8770w
dmi.product.version: A1009D11
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1.1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1~ubuntu14.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.6
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.6
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.7
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 2:2.99.910-0ubuntu1.6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Mon Mar  7 12:08:47 2016
xserver.configfile: default
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.15.1-0ubuntu2.7

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages trusty ubuntu

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https://bugs.launchpad.net/bugs/1554344

Title:
  Mouse left click stops working

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