Symptoms: Attaching a displayport (even in console, with no Xorg loaded) causes 100% CPU usage in kworker, making system extremely unresponsive. See referenced issue on ubuntu bug tracker: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1248256 I'm going to try to get additional logs, but my dmesg is pretty uninteresting. I'll attached the vbios as well. Going to try booting with more debug info. Right now system is too slow (because of this bug) to add the attachments. It also happens with the intel driver, but I haven't been able to trace that one as well. I don't think the cause of the problem is nouveau specific for that reason, but the kworker that is constantly showing up is definitely part of the nouveau code: kworker/0:3-1128 [000] d.s2 1973.688813: workqueue_queue_work: work struct=ffff88046f2135d8 function=od_dbs_timer [cpufreq_ondemand] workqueue=ffff88046d17ba00 req_cpu=0 cpu=0 kworker/0:3-1128 [000] d.h2 1973.704711: workqueue_queue_work: work struct=ffffffff819b85e0 function=push_to_pool workqueue=ffff88046d17ba00 req_cpu=32 cpu=0 kworker/0:3-1128 [000] d.h3 1973.757128: workqueue_queue_work: work struct=ffff88045db116e0 function=nouveau_connector_hotplug_work workqueue=ffff88046d17ba00 req_cpu=32 cpu=0 kworker/0:3-1128 [000] d.h3 1973.830281: workqueue_queue_work: work struct=ffff88045db116e0 function=nouveau_connector_hotplug_work workqueue=ffff88046d17ba00 req_cpu=32 cpu=0 kworker/0:3-1128 [000] d.s3 1973.838757: workqueue_queue_work: work struct=ffff88046f2135d8 function=od_dbs_timer [cpufreq_ondemand] workqueue=ffff88046d17ba00 req_cpu=0 cpu=0 kworker/0:3-1128 [000] d.h2 1973.859889: workqueue_queue_work: work struct=ffffffff819b85e0 function=push_to_pool workqueue=ffff88046d17ba00 req_cpu=32 cpu=0 kworker/0:3-1128 [000] d.h3 1973.903514: workqueue_queue_work: work struct=ffff88045db116e0 function=nouveau_connector_hotplug_work workqueue=ffff88046d17ba00 req_cpu=32 cpu=0 Affected hardware: MacBook pro 10,11 with cinema display (thunderbolt and displayport) IBM Thinkpad with dell display port. Possibly others Versions: xf86-nouveau 1.0.11 kernel 3.14-rc8 (also happens on 3.14 final, as well as earlier versions) Reference issues: https://bugs.freedesktop.org/show_bug.cgi?id=76732 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1248256 https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1020221
Created attachment 96924 [details] vmbios on affected system vmbios after the error occurred (though it's rom so it doesn't matter)
Created attachment 96925 [details] kernel log kernel log during boot and after error occurred. Note i've enabled kernel debugging. It's long. Sorry, had to gzip it
Lots of this going on in the kernel log: [ 773.163695] [drm:drm_helper_hpd_irq_event], [CONNECTOR:17:eDP-1] status updated from connected to connected [ 773.168560] [drm:drm_helper_hpd_irq_event], [CONNECTOR:19:DP-1] status updated from disconnected to disconnected [ 773.226530] [drm:drm_helper_hpd_irq_event], [CONNECTOR:22:DP-2] status updated from connected to connected [ 773.229800] [drm:drm_helper_hpd_irq_event], [CONNECTOR:25:HDMI-A-1] status updated from disconnected to disconnected [ 773.236734] [drm:drm_helper_hpd_irq_event], [CONNECTOR:17:eDP-1] status updated from connected to connected [ 773.241629] [drm:drm_helper_hpd_irq_event], [CONNECTOR:19:DP-1] status updated from disconnected to disconnected [ 773.299627] [drm:drm_helper_hpd_irq_event], [CONNECTOR:22:DP-2] status updated from connected to connected Not sure if that's normal.
I believe this is the same issue as bug 76732, marking as a dup. [ 749.265303] nouveau [ DRM] plugged DP-2 Keeps on happening, which triggers a bunch of work. Somehow it keeps thinking it's getting plugged in. In the other bug it's the eDP screen which causes it. *** This bug has been marked as a duplicate of bug 76732 ***
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