I ran into the same incident on my Lenovo E450 laptop.

Distro: Ubuntu 13.10 (saucy)
Uname: 3.11.0-26-generic
CPU Model: Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz

---------------------------------------------------------------------------------
$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
J5ET44WW (1.15 )
03/12/2015
---------------------------------------------------------------------------------

If there's any ongoing workaround regarding this issue, I would like to
be notified.

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https://bugs.launchpad.net/bugs/1419439

Title:
  Screen freeze when watching video in VLC

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-30-generic 3.16.0-30.40
  ProcVersionSignature: Ubuntu 3.16.0-30.40-generic 3.16.7-ckt3
  Uname: Linux 3.16.0-30-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  prasanna   2562 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Feb  8 18:51:57 2015
  HibernationDevice: RESUME=UUID=0af44a95-238c-498a-88f2-425c00e1c9a6
  InstallationDate: Installed on 2014-12-15 (54 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 24663C1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-30-generic 
root=UUID=0155df5a-b3ef-4cff-bf83-c45841ac9ed0 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-30-generic N/A
   linux-backports-modules-3.16.0-30-generic  N/A
   linux-firmware                             1.138.1
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/26/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G3ET90WW(2.50)
  dmi.board.asset.tag: Not Available
  dmi.board.name: 24663C1
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrG3ET90WW(2.50):bd12/26/2012:svnLENOVO:pn24663C1:pvrThinkPadL430:rvnLENOVO:rn24663C1:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 24663C1
  dmi.product.version: ThinkPad L430
  dmi.sys.vendor: LENOVO

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