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 -- You received this bug notification because you are a member of Ubuntu Touch seeded 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1435587/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp