This does not appear to be exclusive to the nouveau or xorg. I've been able to reproduce it at the console by plugging in display port without X11 running.
I open htop, everything looks fine. Then I plug in the display port cable and the CPU immediately shoots up to 100%. I've also loaded the intel driver (rebooting into macOS, selecting integrated driver and confirming it is running with vga_switcheroo once i reboot back into linux), and i get the exact same behavior. Note, booting with the displayport cable attached will cause the system to hang during initialization, I guess because the kworker takes 100% of the CPU. I've also had this happen with the proprietary nvidia driver loaded. This doesn't seem to have anything to do with the graphics driver, but rather the kernel itself is having a hard time with the thunderbolt port managing the display port connection. Oddly enough, this issue doesn't happen 100% of the time for me. I've had days where it didn't happen at all, and days where it is non stop. I'm running out of ideas on debugging this one, other than that the problem is almost certainly in the kernel itself, and is probably related to sketchy thunderbolt support since this never happens with just normal HDMI output. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/1248256 Title: [MacBookPro10,1] Plugging in displayport monitor causes kworker to take 100% CPU Status in “xserver-xorg-video-nouveau” package in Ubuntu: Confirmed Bug description: I'm seeing the same symptoms as described by: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video- nouveau/+bug/1020221 I thought it would be worth reporting, because I just upgraded to the new Ubuntu 13.10, so it hasn't been resolved yet. ProblemType: Bug DistroRelease: Ubuntu 13.10 Package: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1 ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3 Uname: Linux 3.11.0-12-generic x86_64 NonfreeKernelModules: wl .tmp.unity.support.test.0: ApportVersion: 2.12.5-0ubuntu2.1 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Tue Nov 5 10:58:19 2013 DistUpgraded: 2013-11-03 13:42:12,641 DEBUG enabling apt cron job DistroCodename: saucy DistroVariant: ubuntu DkmsStatus: bcmwl, 6.30.223.141+bdcom, 3.11.0-12-generic, x86_64: installed bcmwl, 6.30.223.141+bdcom, 3.8.0-32-generic, x86_64: installed virtualbox, 4.2.16, 3.11.0-12-generic, x86_64: installed virtualbox, 4.2.16, 3.8.0-32-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Apple Inc. Device [106b:00f7] NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition] [10de:0fd5] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Apple Inc. Device [106b:00f2] InstallationDate: Installed on 2013-07-03 (125 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MachineType: Apple Inc. MacBookPro10,1 MarkForUpload: True ProcEnviron: LANGUAGE=en_US TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: \boot\vmlinuz-3.11.0-12-generic ro root=UUID=759bfd6b-68b3-4455-ba2a-c79286c0bcc1 initrd=boot\initrd.img-3.11.0-12-generic SourcePackage: xserver-xorg-video-nouveau UpgradeStatus: Upgraded to saucy on 2013-11-03 (1 days ago) dmi.bios.date: 12/21/2012 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP101.88Z.00EE.B03.1212211437 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-C3EC7CD22292981F dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro10,1 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-C3EC7CD22292981F dmi.modalias: dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B03.1212211437:bd12/21/2012:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F: dmi.product.name: MacBookPro10,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.46-1 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: Tue Nov 5 10:24:31 2013 xserver.configfile: default xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.14.3-3ubuntu2 xserver.video_driver: nouveau --- .tmp.unity.support.test.0: ApportVersion: 2.13.2-0ubuntu2 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity DistUpgraded: Fresh install DistroCodename: trusty DistroRelease: Ubuntu 14.04 DistroVariant: ubuntu ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Apple Inc. Device [106b:00f7] NVIDIA Corporation GK107M [GeForce GT 650M Mac Edition] [10de:0fd5] (rev a1) (prog-if 00 [VGA controller]) Subsystem: Apple Inc. Device [106b:00f2] InstallationDate: Installed on 2014-01-31 (0 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64+mac (20140130) MachineType: Apple Inc. MacBookPro10,1 Package: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu1 PackageArchitecture: amd64 ProcKernelCmdLine: \boot\vmlinuz-3.13.0-5-generic ro root=UUID=ac629b0b-84b0-46a1-9aae-ecb1ecfdc46c initrd=boot\initrd.img-3.13.0-5-generic ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0 Tags: trusty ubuntu reproducible compiz-0.9 Uname: Linux 3.13.0-5-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 12/21/2012 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP101.88Z.00EE.B03.1212211437 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-C3EC7CD22292981F dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro10,1 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-C3EC7CD22292981F dmi.modalias: dmi:bvnAppleInc.:bvrMBP101.88Z.00EE.B03.1212211437:bd12/21/2012:svnAppleInc.:pnMacBookPro10,1:pvr1.0:rvnAppleInc.:rnMac-C3EC7CD22292981F:rvrMacBookPro10,1:cvnAppleInc.:ct10:cvrMac-C3EC7CD22292981F: dmi.product.name: MacBookPro10,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2 version.xserver-xorg-core: xserver-xorg-core 2:1.14.5-1ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu1 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.907-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu1 xserver.bootTime: Thu Jan 30 19:51:12 2014 xserver.configfile: default xserver.errors: Failed to load module "nvidia" (module does not exist, 0) Failed to load module "nvidia" (module does not exist, 0) NOUVEAU(G0): [XvMC] Failed to initialize extension. xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.14.5-1ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1248256/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
