Note: kworker/0:1 was found to have extremely CPU usage through ps
-auxf:
root 15854 50.0 0.0 0 0 ? R 17:35 2:09 \_
[kworker/0:1]
There are a number of other threads with similar output:
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
^C
The output is from: /sys/kernel/debug/tracing/trace_pipe
It appears that the hotplug function is failing and being readded to the queue
over and over again.
Note that this output was obtained while the nouveau GPU was active via
vga_switcheroo.
--
You received this bug notification because you are a member of Ubuntu-X,
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
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1248256/+subscriptions
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