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[CarVac <1199877@xxxxxxxxxxxxxxxxxx>]

I have been experiencing this issue too, but it seems to affect me more
severely:

While the panel is pegging one of my 8 (4 with hyperthreading) cores, if
I try to use the HUD or system tray applets, I have about 10 seconds
within which to launch a terminal and kill the process before my
computer becomes completely and utterly unresponsive for 40 seconds.

Anything that doesn't seem to require user input, such as music or video
players, keep on playing.

The cursor moves, but it doesn't seem to affect anything, until after
the 40 seconds are up, and all of my inputs (mouse and keyboard) from
that duration are rapidly applied in sequence. Does this happen to other
people?

While it is chewing up a core, the clock stops counting up (visible
because I have it set to display seconds), but I usually don't notice it
until it's too late.

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https://bugs.launchpad.net/bugs/1199877

Title:
  unity-panel-service pegs one of my CPUs at 100%

Status in The Ubuntu Power Consumption Project:
  New
Status in Unity:
  In Progress
Status in “unity” package in Ubuntu:
  Triaged

Bug description:
  Just going about my business on Ubuntu Raring amd64 on an x230 and I
  heard the fan kick into action.  top showed me that unity-panel-
  service was consuming all the free cycles on one of my CPUs.  I killed
  it before my machine overheated, so I didn't attach a debugger to see
  why it was totally pegging out a  CPU.

  I'm not sure if this adds any context, but I was using a LibreOffice
  spreadsheet and I could not insert a table because the menu had lost
  it's mind, and then I observed the overly loaded CPU a very short
  while after that.

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