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[Nick Dowson <nickmdowson@xxxxxxxxx>]

Hi Christopher,
Thanks for your response. Actually in the end I re-installed a debian system, so I can't really help with any more diagnostics from the system that was having the problem.

I can report that I'm not seeing this crash on the same laptop with the 3.16.0-4-amd64 kernel and Debian Jessie installed. I'll notify here if it reaapears in Debian, too.
Best wishes,
Nick Dowson

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Packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1435587

Title:
  System slows down to almost unusable then freezes during usage (High
  kworker cpu usage etc)

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  Hi, after an update about a month and a half / two months ago my
  system started freezing after a period of usage. This tends to happen
  about once a day... so generally after the laptop's been on for a few
  hours (not necessarily constantly), sometimes probably up to 8 or ten
  hours. But the freezing doesn't seem to correlate to any particular
  activity or application that I am using.

  When the freeze occurs, the system slows down and doing anything takes
  excruciatingly long. It never recovers from this and I have to
  shutdown. Sometime REISUB can take the system down but sometimes I
  just have to hold the power button to switch it off the harmful way! A
  few times I have managed to get 'System Activity' (KDE Task Manager)
  or top up before it has frozen completely and this has shown multiple
  Kworker processes using up huge amounts of CPU.

  Looking this up on the forums I found a couple of suggested solutions:
  I tried turning off acpi interrupts for certain gpes
  (http://askubuntu.com/questions/176565/why-does-kworker-cpu-usage-get-
  so-high). I initially thought this had helped, but it hasn't (possibly
  slowing down the frequency of the freezes). I also tried the drm_kms
  helper fix: https://souriguha.wordpress.com/2011/03/08/how-to-solve-
  problem-with-thinkpadkslowd-kworker-on-linux-kernel-2-35-2-36/. Alas,
  no success.

  As I said, the freezing first occured almost two months ago, whilst I
  was using Ubuntu 14.04. I upgrade to 14.10 to see if this would help
  the freeze but no luck.

  Happy to try further diagnostics or any suggested workarounds
  appreciated; I got a bit lost in the different wiki pages and wasn't
  sure whether this was really the same sort of freeze / crash as they
  were talking about (I don't think it really has anything to do with
  xorg!)

  Cheers.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xorg 1:7.7+7ubuntu2
  ProcVersionSignature: Ubuntu 3.16.0-31.43-generic 3.16.7-ckt5
  Uname: Linux 3.16.0-31-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Mon Mar 23 21:53:17 2015
  InstallationDate: Installed on 2014-05-02 (325 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to utopic on 2015-02-17 (34 days ago)

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