The welcome screen does not work properly.

The welcome screen does not work properly. If you use the "capslock" as a language change, the upper panel hangs and does not switch the input language. In some cases, such as the withering of the screen, when you try to change the language, the welcome screen disappears completely for a second displaying the contents of the desktop. In this case, to switch the language, you must first go to another terminal "ctrl+alt+f6" to get back on and using the mouse to change the language.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160715-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia wl
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 340.96 Sun Nov 8 22:33:28 PST 2015
 GCC version: gcc version 5.3.1 20160413 (Ubuntu 5.3.1-14ubuntu2.1)
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
BootLog:

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: Fri Aug 5 09:07:46 2016
DistUpgraded: 2016-05-02 07:45:03,189 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: xenial
DistroVariant: ubuntu
DpkgLog:

EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] 3rd Gen Core processor Graphics Controller [1025:0774]
   Subsystem: Acer Incorporated [ALI] GeForce 710M [1025:0774]
InstallationDate: Installed on 2015-08-27 (343 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Acer Aspire V5-571G
ProcEnviron:
 PATH=(custom, user)
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 LANGUAGE=en_US
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic root=UUID=16663f38-1066-4705-8799-0ab393b5acfc ro quiet splash
SourcePackage: unity
UpgradeStatus: Upgraded to xenial on 2016-05-02 (95 days ago)
dmi.bios.date: 02/27/2013
dmi.bios.vendor: Phoenix Technologies Ltd.
dmi.bios.version: V2.17
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Aspire V5-571G
dmi.board.vendor: Acer
dmi.board.version: V2.17
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 9
dmi.chassis.vendor: Acer
dmi.chassis.version: V2.17
dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV2.17:bd02/27/2013:svnAcer:pnAspireV5-571G:pvrV2.17:rvnAcer:rnAspireV5-571G:rvrV2.17:cvnAcer:ct9:cvrV2.17:
dmi.product.name: Aspire V5-571G
dmi.product.version: V2.17
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.12.2+16.04.20160526-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Fri Aug 5 08:35:27 2016
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 NVIDIA(0): Failed to initiate mode change.
 NVIDIA(0): Failed to complete mode change
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.18.3-1ubuntu2.2