[Bug 1173521] [NEW] plasma-desktop burning 90-100% of a cpu (after update to raring)

[TerryHeidelberg]

Public bug reported:

After update to 13.04, I noticed high cpu percentages for plasma-desktop and for Xorg.
'top' shows plasma-desktop using 90-100% of a cpu, and Xorg using about 40-50%.    If I
use gdb to attach to the plasma-desktop main process pid, then (of course) p-d goes
to zero cpu percentage, and Xorg goes to less than 5%.

I'll attach a log of a gdb session where I ^C'd the p-d process several times, then did 'where'
after each interruption.

The log also shows the result of running 'strace -p xxxx' on the p-d
process, FWIW.

root at terry-vm:~# uname -a
Linux terry-vm 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

root at terry-vm:~# ubuntu
LSB Version:    core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 13.04
Release:        13.04
Codename:       raring

The version of plasma-desktop is 4:4.10.2-0ubuntu2

After I updated to 13.04, the graphical updater quit at the very end of the "updating" phase, and
warned that the system might be un-usable, although I have not noticed any obvious missing pieces
of my usual Kubuntu environment.      I use the Nvidia video driver, so I took the opportunity to
download the latest driver from Nvidia, compiled and installed that.    I'll attach the related
Xorg.0.log file, FWIW.

** Affects: kde-workspace (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "log file of gdb and strace outputs"
   https://bugs.launchpad.net/bugs/1173521/+attachment/3655937/+files/gdb.on.plasma-desktop.log

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Title:
  plasma-desktop burning 90-100% of a cpu (after update to raring)

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