Xorg freeze

[Naroga]

Switching between system terminal (CTRL+ALT+F1, for example) and the GUI sometimes causes the terminal (not the GUI!) to freeze. It still responds to keystrokes, so if I type "sudo reboot", the system does reboot. However, I can't see what I'm typing, for the terminal is locked on the last output.

Only happens in 16.04.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2
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: Tue May 3 10:41:11 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Broadwell-U Integrated Graphics [1028:069a]
   Subsystem: Dell GM108M [GeForce 830M] [1028:069a]
InstallationDate: Installed on 2016-04-29 (4 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: Dell Inc. Vostro 14-5480
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=ec6bd22f-f672-4213-bb8d-5c0b189705c2 ro quiet splash
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
XorgLogOld:

dmi.bios.date: 07/07/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0FVD51
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd07/07/2015:svnDellInc.:pnVostro14-5480:pvrA04:rvnDellInc.:rn0FVD51:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: Vostro 14-5480
dmi.product.version: A04
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
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.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2
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: Tue May 3 06:55:16 2016
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4924
 vendor AUO
xserver.version: 2:1.18.3-1ubuntu2

[penalvch (penalvch)]

Naroga, thank you for reporting this and helping make Ubuntu better.

To clarify, does using the proprietary nvidia drivers provide a WORKAROUND?

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]