Public bug reported:

Screen freezes when I watch video in VLC media player. Moving mouse is
  of no use and Ctrl + Alt + T short cut does not launch terminal. But I
  Could hear the audio even after screen freeze.

  If I press Ctrl + Alt + F1 and wait for several minutes switches to
  console. Then switching to GUI brings back the screen and I am able to
  work as usual.

I was told I should file a new report with the Ubuntu repository kernel (not 
mainline/upstream).
I had filed it against VLC initially.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-36-generic 4.4.0-36.55
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  pinaar     7369 F.... pulseaudio
 /dev/snd/controlC0:  pinaar     7369 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Sep  1 22:26:15 2016
HibernationDevice: RESUME=UUID=2c0487df-e541-4dbc-b0b2-abde7e5ff527
InstallationDate: Installed on 2015-07-19 (411 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150724)
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcFB:
 
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-36-generic 
root=/dev/mapper/ubuntu--vg-root ro net.ifnames=0 biosdevname=0 quiet splash 
nomodeset
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-36-generic N/A
 linux-backports-modules-4.4.0-36-generic  N/A
 linux-firmware                            1.158~ubuntu16.04.1~ppa1
RfKill:
 
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-04-24 (130 days ago)
dmi.bios.date: 04/20/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.90
dmi.board.name: X99 Extreme4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.90:bd04/20/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnX99Extreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

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


** Tags: amd64 apport-bug third-party-packages xenial

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https://bugs.launchpad.net/bugs/1619542

Title:
  Screen freeze when watching video in VLC

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