Also seeing this on both of our machines, both upgraded from Intrepid to
Jaunty this afternoon.  Both were updated using the cdromupdate method
from alternate CDs.  One with internet package updates, the other
without.

 * Lenovo W500 (ATI Radeon HD 3650 (fglrx driver), Intel Core 2 Duo)
 * Custom-built (Athlon X2 4800, nVidia GeForce 7600 GS (proprietary driver))

If I add a few standard widgets to the desktop even a single account
takes 100% of both CPUs.  kde4d always seems to take 100% of one CPU for
each logged in user, plasma goes up to 100%.  Xorg process is not
showing any particularly high load (~2%).  Enabling "desktop effects"
(compiz) does not change CPU usage.

One machine (Lenovo) is rather unstable (multiple plasma crashes), but
that's likely because it's getting to 73 deg Fahrenheit due to the
overloading if there's anything else running on the machine.  It's up to
63 deg with just the one CPU pegged. The machines are rendered unusable,
so I would suggest we may need a slightly higher priority than "low".
The referenced kdelibs bug does not appear to be relevant, as I'm not
AFAIK using kget (though I suppose one of the widgets might have used
it).

>From the Lenovo's Xorg.0.log:

(WW) Falling back to old probe method for fglrx
(II) ATI Proprietary Linux Driver Version Identifier:8.60.40
(II) ATI Proprietary Linux Driver Release Identifier: 8.60.4
(II) ATI Proprietary Linux Driver Build Date: Mar 14 2009 21:46:40
(II) Loading PCS database from /etc/ati/amdpcsdb
(WW) This ATI Proprietary Linux Driver does not guarantee support of video 
driver ABI higher than 2.0
(WW) Video driver ABI version of the X server is 5.0
...
(II) fglrx(0): driver needs X.org 1.4.x.y with x.y >= 99.906
(WW) fglrx(0): could not detect X server version (query_status=-1)

Don't seem to be any relevant Errors or Warnings in the AMD's
Xorg.0.log.

GDB connect backtrace on the Lenovo:

#0  0x00007f482a61b1c0 in __pthread_mutex_unlock_usercnt () from 
/lib/libpthread.so.0
#1  0x00007f48289bdb1c in xcb_poll_for_reply () from /usr/lib/libxcb.so.1
#2  0x00007f482d13b80f in ?? () from /usr/lib/libX11.so.6
#3  0x00007f482d13c345 in _XEventsQueued () from /usr/lib/libX11.so.6
#4  0x00007f482d124ed3 in XEventsQueued () from /usr/lib/libX11.so.6
#5  0x00007f482e5b3e5c in ?? () from /usr/lib/libQtGui.so.4
#6  0x00007f4829a7ced2 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#7  0x00007f4829a7d7c9 in ?? () from /usr/lib/libglib-2.0.so.0
#8  0x00007f4829a7da7c in g_main_context_iteration () from 
/usr/lib/libglib-2.0.so.0
#9  0x00007f482d99be6f in QEventDispatcherGlib::processEvents () from 
/usr/lib/libQtCore.so.4
#10 0x00007f482e5b3c9f in ?? () from /usr/lib/libQtGui.so.4
#11 0x00007f482d971002 in QEventLoop::processEvents () from 
/usr/lib/libQtCore.so.4
#12 0x00007f482d9713cd in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#13 0x00007f482d973694 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#14 0x00007f4830200cd7 in kdemain () from /usr/lib/libkdeinit4_kded4.so
#15 0x00007f482bdc55a6 in __libc_start_main () from /lib/libc.so.6
#16 0x0000000000400759 in _start ()

-- 
Kubuntu jaunty: kded4 at 100% of CPU load
https://bugs.launchpad.net/bugs/333944
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