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My laptop just ran some updates, and when prompted to restart, I did.

Now my CPU is maxing out, and my battery barely lasts 20 minutes. The processes that are going crazy are:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                                                                          
  933 root      20   0  310236  68632   5328 S  59.4  0.9  19:13.65 polkitd                                                                                          
  520 message+  20   0   40636   3764   2256 R  31.5  0.0  10:05.80 dbus-daemon                                                                                      
  570 root      20   0   45368   5164   2856 S  21.6  0.1   6:58.41 systemd-logind                                                                                   
  904 root      20   0  345580  11164   8656 S  15.9  0.1   5:08.16 NetworkManager                                                                                   
 1423 root      20   0 2100456   8164   4980 S  13.0  0.1   4:10.18 console-kit-dae

This has happened once before, about a year ago, but I can't remember how I fixed it. I do remember upvoting this question/answer, but the solution there doesn't work for me now (and I think I upvoted it because it was a step in the right direction, not a solution itself).

When I run dbus-monitor --system I see a lot of NameOwnerChanged events. Here's some sample output from dbus-monitor --system "member=NameOwnerChanged":

signal sender=org.freedesktop.DBus -> dest=(null destination) serial=376312 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameOwnerChanged
   string ":1.191451"
   string ""
   string ":1.191451"
signal sender=org.freedesktop.DBus -> dest=(null destination) serial=376313 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameOwnerChanged
   string ":1.191452"
   string ""
   string ":1.191452"
signal sender=org.freedesktop.DBus -> dest=(null destination) serial=376314 path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; member=NameOwnerChanged
   string ":1.191452"
   string ":1.191452"
   string ""

There's about 100 NameOwnerChanged events coming through per second.

It's very frustrating. What should I try next?

  • Well, I ended up testing Ubuntu 16.04 on a live-USB, and it didn't have the problem, so I upgraded my whole distro. I wish I knew the cause of the issue, but at least I can go back to using my laptop batter for more than 20 minutes... – Jason O'Neil Jul 17 '16 at 22:54

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