<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - Kworker using 100% CPU" href="https://bugs.freedesktop.org/show_bug.cgi?id=76732#c30">Comment # 30</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - Kworker using 100% CPU" href="https://bugs.freedesktop.org/show_bug.cgi?id=76732">bug 76732</a> from <a class="email" href="mailto:daleha@gmail.com" title="Dale Hamel <daleha@gmail.com>"> Dale Hamel</a> <pre>I recently generated this bug: <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED DUPLICATE - [nouveaun NVE0] Attaching displayport spawns kworker taking up 100% cpu" href="show_bug.cgi?id=77073">https://bugs.freedesktop.org/show_bug.cgi?id=77073</a> Which appears to only happen when external, displayport display is attached. I'm going to try rolling back to kernel 3.8 to see if that resolves it. I attached a bunch of debug info to my ticket which I hope will be useful. The main thing of note is that the kworker is doing: 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 Over and over again.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>