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[Arnaud Croes <arnaud@xxxxxxxxxxx>]

Hi, I was having the exact same problem. Sometimes the system froze with a kernel-panic (keyboard LEDs flashing), sometimes it just froze without. 
This happened sometimes after 30 minutes, sometimes it took a few hours. 
I could not access through SSH either after the system froze. Ctrl- + Alt + F1 did not work, nor Alt + SysRq + k. 
Only using Alt + SysRq + reisub, or a hard reset helped. No logs or traces were available. 

Upgraded now to kernel 4.0.0-040000rc7-generic, not seen the problem
since (fingers crossed).

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https://bugs.launchpad.net/bugs/1496262

Title:
  [Samsung NP530U3B-A01IT] Random hangs / freezes

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Since the latest kernel upgrade I'm experiencing random system freezes.
  Sadly I couldn't find debug informations

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-generic 3.19.0.29.28
  ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  maxxer     2482 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Sep 16 09:15:01 2015
  HibernationDevice: RESUME=UUID=eb9511be-fc9f-4d11-ab64-5a842aa39dad
  InstallationDate: Installed on 2015-04-04 (164 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 530U3BI/530U4BI/530U4BH
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-22-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-22-generic N/A
   linux-backports-modules-3.19.0-22-generic  N/A
   linux-firmware                             1.143.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] File o directory non esistente: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/04/2012
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: 03XK
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 530U3BI/530U4BI/530U4BH
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvr03XK:bd01/04/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn530U3BI/530U4BI/530U4BH:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rn530U3BI/530U4BI/530U4BH:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 530U3BI/530U4BI/530U4BH
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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