Enable CPU frequency change for everyone by Gnome Applet

System Debian Squeeze/Sid: Policykit-1 missed rule by default setup

sudo nano /etc/polkit-1/localauthority/30-site.d/50-cpufreq.pkla 

add user to "adm" group,

sudo adduser username adm

insert Text

[CPU Frequency should be allowed for everyone]
Identity=unix-group:adm
Action=org.gnome.cpufreqselector
ResultActive=yes
ResultInactive=yes