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I got the same problem. This appeared when I did an update in 15.04. I
thought that upgrading to 15.10 would solve the problem. So on and so
forth.

I gave it a little test. If you know your mouse device in 'xinput
--list' try to test it with xinput --test %id%' where %id% is your mouse
device id in xinput. Leave that test run in a terminal window and open
another terminal. In the second terminal cat the device input file into
the terminal. On my system it's /dev/input/mouse0. Get the mouse events
to stream into the terminal with 'sudo cat /dev/input/mouse0'.

Just to be clear, try these commands in two separate terminals:
xinput --test %id%
sudo cat /dev/input/mouse0

You'll notice that your mouse motions appear in both terminals in
addition to the right button clicks. As for the left bottom clicks. Keep
clicking the left mouse button and you'll notice that both terminals
won't show the input event every now and then.

If this turns out to be the case for a lot of users that experience this
problem. The error would have to be in the system and driver processes.

As for the broken mouse button. My mouse works fine in another
installation of ubuntu 13.4? or 14.4? It's a wireless mouse and keyboard
that connects to the usb port.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1316873

Title:
  Left mouse button stops working

Status in xorg package in Ubuntu:
  Expired

Bug description:
  This  problem has plagued me for a few years across different laptops
  and Ubuntu versions. Current I am experiencing this on a Dell Inspiron
  15z running Ubuntu 14.04 LTS.

  It typically starts after I have used the chat or call feature in
  gmail, by clicking on the phone icon in the left chat margin. I am a
  Firefox user and have not tested this with chrome etc. It has not
  happened if i dont install google-talkplugin so it is quite possible
  that the plugin is to blame.

  Symptom
  =======
  The left mouse button on all attached mice - USB , Trackpad and touch - will not do anything .... however the right mouse button continues to work.  This happens to all applications and also to the desktop. The keyboard continues to function as normal.

  When this occurs , my solution is to Alt-F4 close all windows and log
  out of the X session. When I re-login the left mouse button works as
  normal.

  
  This is an irritant and work disruptor as I have to save all browser and desktop applications to  safe state before I logout to reset the mouse. I will appreciate any soltion or workaround.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Tue May  6 21:41:29 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:058f]
  InstallationDate: Installed on 2014-04-17 (19 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Inspiron 5523
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=f5004b03-b37f-4733-88a8-51c6f3bd0a4d ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/18/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0GKGJG
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A05
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd05/18/2013:svnDellInc.:pnInspiron5523:pvrNotSpecified:rvnDellInc.:rn0GKGJG:rvrA05:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 5523
  dmi.product.version: Not Specified
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  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
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Tue May  6 21:20:40 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5558 
   vendor                                     CMN
  xserver.version: 2:1.15.1-0ubuntu2

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