Public bug reported: On a machine with Ubuntu 13.10 and an NVIDIA GT 640 graphics card, I had one monitor connected to the DVI-I port, and when I connected another monitor, to the DP port, kworker started running at 100%, and it still does after I unplugged the DP monitor. While I had the two monitors connected, the system would freeze for up to several minutes when I used the System Settings --> Display and Monitor, and I never managed to get anything shown on the DP monitor.
Also when filing this report (i.e. running 'ubuntu-bug xorg'), the system was unresponsive (cursor could not be moved, keyboard did not work) for 5 minutes. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: xorg 1:7.7+1ubuntu6 ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10 Uname: Linux 3.11.0-15-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: kwin Date: Fri Jan 10 19:20:55 2014 DistUpgraded: Fresh install DistroCodename: saucy DistroVariant: ubuntu GraphicsCard: NVIDIA Corporation GK107 [GeForce GT 640 OEM] [10de:0fc0] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Pegatron Device [1b0a:90c5] InstallationDate: Installed on 2013-12-19 (22 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) LightdmGreeterLog: ** (process:13742): WARNING **: Failed to open sessions directory: Error opening directory '/usr/share/lightdm/sessions': No such file or directory file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: Unable to assign [undefined] to QString usersession LightdmGreeterLogOld: ** (process:1486): WARNING **: Failed to open sessions directory: Error opening directory '/usr/share/lightdm/sessions': No such file or directory file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: Unable to assign [undefined] to QString usersession MachineType: Hewlett-Packard HP Elite 7500 Series MT MarkForUpload: True ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic.efi.signed root=UUID=01f38498-9cfc-4d1a-85f7-fc23055daf6d ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/18/2013 dmi.bios.vendor: AMI dmi.bios.version: 8.18 dmi.board.name: 2AD5 dmi.board.vendor: PEGATRON CORPORATION dmi.board.version: 1.03 dmi.chassis.asset.tag: CZC3376X0X dmi.chassis.type: 3 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnAMI:bvr8.18:bd03/18/2013:svnHewlett-Packard:pnHPElite7500SeriesMT:pvr1.00:rvnPEGATRONCORPORATION:rn2AD5:rvr1.03:cvnHewlett-Packard:ct3:cvr: dmi.product.name: HP Elite 7500 Series MT dmi.product.version: 1.00 dmi.sys.vendor: Hewlett-Packard version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.46-1ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3 version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1 xserver.bootTime: Mon Jan 6 17:58:19 2014 xserver.configfile: default xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.14.3-3ubuntu2 xserver.video_driver: nouveau ** Affects: xorg (Ubuntu) Importance: Low Status: Incomplete ** Tags: amd64 apport-bug latest-bios-8.17 needs-trusty-test regression-potential saucy ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1267960 Title: Plugging in displayport monitor (as second monitor) causes system to temporarily freeze and kworker to run at 100% CPU forever To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1267960/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs