diff -urN gkrellm2-cpufreq-0.6.1-orig/cpufreq.c gkrellm2-cpufreq-0.6.1/cpufreq.c
--- gkrellm2-cpufreq-0.6.1-orig/cpufreq.c	2007-07-15 16:01:29.000000000 +0200
+++ gkrellm2-cpufreq-0.6.1/cpufreq.c	2007-08-14 17:14:49.247886178 +0200
@@ -74,6 +74,8 @@
 static GkrellmDecal* text_decal_freq[NCPU_MAX];
 static GkrellmDecal* text_decal_gov[NCPU_MAX];
 
+static GkrellmDecalbutton* button_cpu_toggle[NCPU_MAX];
+
 static GkrellmKrell* slider_krell[NCPU_MAX];
 static GkrellmKrell* slider_in_motion[NCPU_MAX];
 static double slider_value[NCPU_MAX];
@@ -297,6 +299,25 @@
   return FALSE;
 }
 
+static void cpu_online_toggle(GkrellmDecalbutton *button, gpointer data)
+{
+  int n = -1, i;
+  for(i = 0; i < ncpu; i++)
+    if (button == button_cpu_toggle[i])
+    {
+      n = i;
+      break;
+    }
+  
+  if (n >= 0)
+  {
+    char cmd[length];
+    snprintf(cmd, length, "sudo %s/cpu_online_toggle %d", HELPERDIR, n);
+    system(cmd);
+  }
+}
+
 static void create_plugin(GtkWidget* vbox, gint first_create) {
   GkrellmStyle* style;
   GkrellmPiximage* krell_image;
@@ -331,6 +352,11 @@
       governor_text[cpu] = empty;
     }
 
+    /* the on/off button */
+    button_cpu_toggle[cpu] = gkrellm_make_scaled_button(panel, NULL, &cpu_online_toggle, NULL,
+							TRUE, TRUE, 2, 0, 1,
+							gkrellm_chart_width() - 9, y, 8, 8);
+
     /* the frequency text */
     text_decal_freq[cpu] =
       gkrellm_create_decal_text(panel, "0123456789 MHz", ts, style,
diff -urN gkrellm2-cpufreq-0.6.1-orig/cpu_online_toggle gkrellm2-cpufreq-0.6.1/cpu_online_toggle
--- gkrellm2-cpufreq-0.6.1-orig/cpu_online_toggle	1970-01-01 01:00:00.000000000 +0100
+++ gkrellm2-cpufreq-0.6.1/cpu_online_toggle	2007-08-14 17:18:52.418788933 +0200
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+n=$1
+if [ "$n" = "" ]; then
+    echo "Usage: $0 <CPU number>"
+    exit
+fi
+
+sys_file=/sys/devices/system/cpu/cpu${n}/online
+if [ ! -f $sys_file ]; then
+    echo "CPU ${n} is not toggleable"
+    exit
+fi
+
+old_state=$(cat $sys_file)
+
+if [ "$old_state" = "1" ]; then
+    echo -n "0" > $sys_file
+else
+    echo -n "1" > $sys_file
+fi
diff -urN gkrellm2-cpufreq-0.6.1-orig/Makefile gkrellm2-cpufreq-0.6.1/Makefile
--- gkrellm2-cpufreq-0.6.1-orig/Makefile	2007-07-15 16:01:29.000000000 +0200
+++ gkrellm2-cpufreq-0.6.1/Makefile	2007-08-14 17:18:58.971789231 +0200
@@ -12,20 +12,24 @@
 
 OBJS = cpufreq.o
 
+HELPERDIR=$(DESTDIR)/usr/lib/gkrellm2/exec
+CFLAGS+=-DHELPERDIR=\"$(HELPERDIR)\"
+
 cpufreq.so: $(OBJS)
 	$(CC) $(OBJS) -o cpufreq.so $(LFLAGS) $(LIBS)
 
-install: cpufreq.so
+install: cpufreq.so cpu_online_toggle
 	install -D -m 755 -s cpufreq.so $(DESTDIR)/usr/lib/gkrellm2/plugins/cpufreq.so
 	install -g root -o root -D -m 755 cpufreqnextgovernor $(DESTDIR)/usr/sbin/cpufreqnextgovernor
+	install -g root -o root -D -m 755 cpu_online_toggle $(HELPERDIR)/cpu_online_toggle
 
 install-sudo:
 	echo "$(USER) ALL = (root) NOPASSWD: /usr/bin/cpufreq-set -c [0-9]* -g userspace" >> /etc/sudoers
 	echo "$(USER) ALL = (root) NOPASSWD: /usr/bin/cpufreq-set -c [0-9]* -f [0-9]*" >> /etc/sudoers
 	echo "$(USER) ALL = (root) NOPASSWD: /usr/sbin/cpufreqnextgovernor" >> /etc/sudoers
+	echo "$(USER) ALL = (root) NOPASSWD: $(HELPERDIR)/cpu_online_toggle" >> /etc/sudoers
 
 clean:
 	rm -f *.o core *.so* *.bak *~
 
 cpufreq.o: cpufreq.c
-