CPU Resource Monitor ignores CPUs when 1 CPU is hotplugged

[r4d2]

When Hotplugging a CPU Core (disableing it, see below), the CPU Resource Monitor shows all CPUs with a ID equal or greater than the ID of the hotplugged CPU with 0.0%, even though that is not the case.

In my case:
Im running a AMD X4 System with 4 Cores.
I disable core 2 via 'echo 0 > /sys/devices/system/cpu/cpu2/online' (Hotplugging via the Method described here http://www.cyberciti.biz/faq/debian-rhel-centos-redhat-suse-hotplug-cpu/)
At the same time Im running a Thread that puts core 3 at full load.
After disabling, the CPU Resource Monitor shows core 2 and core 3 at 0.0% even though core 3 is still running at close to 100%.
After restarting the System Monitor it only shows cores 0 and 1. Core 3 is not shown, even though it is still enabled and still shows up in /proc/cpuinfo

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: gnome-system-monitor 2.28.1-1ubuntu1
ProcVersionSignature: Ubuntu 2.6.35-30.54-generic 2.6.35.13
Uname: Linux 2.6.35-30-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Thu Jul 14 15:49:23 2011
ExecutablePath: /usr/bin/gnome-system-monitor
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: gnome-system-monitor

[Robert Roth (evfool)]

 Thank you for your bug report. This bug has been reported to the developers of the software. You can track it and make comments at: https://bugzilla.gnome.org/show_bug.cgi?id=352807.