********** ANNOTATED ************

********************************************
**** Laptop state straight after reboot ****
********************************************
Script started on Fri 03 Jul 2009 12:41:39 PM CEST

***********************************************
**** Laptop booted with AC power connected ****
***********************************************
root@tails:/home/jrt# cat /proc/acpi/ac_adapter/AC/state 
state:                   on-line
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (4)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (5)

***************************************************************
***** Attempt to adjust frequencies using SYSFS interface *****
***************************************************************
root@tails:/home/jrt# for i in 0 1 ; do
> echo 2000000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq
> done
root@tails:/home/jrt# for i in 0 1 ; do
> echo 2000000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq
> done

************************************
***** New frequencies accepted *****
************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.00 GHz and 2.00 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.00 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (5)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.00 GHz and 2.00 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.00 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (6)

******************************************************
***** Attempt to change governor and frequencies *****
******************************************************
root@tails:/home/jrt# for i in 0 1 ; do
> echo "performance" > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_governor
> done
root@tails:/home/jrt# for i in 0 1 ; do
> echo 2501000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq
> done
root@tails:/home/jrt# for i in 0 1 ; do echo 2501000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq; done

*************************************************************************
***** New governor accepted, frequencies accepted with new governor *****
*************************************************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (6)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (7)

***************************************
***** Unplug AC power from laptop *****
***************************************
root@tails:/home/jrt# cat /proc/acpi/ac_adapter/AC/state 
state:                   off-line

******************************************
***** Governor changed automatically *****
******************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (6)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (7)

****************************************************************
***** Attempt to change frequencies while on battery power *****
****************************************************************
root@tails:/home/jrt# for i in 0 1 ; do echo 2000000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq ; done
root@tails:/home/jrt# for i in 0 1 ; do echo 2000000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq ; done

************************************
***** New frequencies accepted *****
************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.00 GHz and 2.00 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.00 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (7)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.00 GHz and 2.00 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.00 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (8)
root@tails:/home/jrt# for i in 0 1 ; do echo 2000000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq ; done
root@tails:/home/jrt# for i in 0 1 ; do echo 2501000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq ; done
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (8)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (11)

******************************
***** Reconnect AC power *****
******************************
root@tails:/home/jrt# cat /proc/acpi/ac_adapter/AC/state 
state:                   on-line

******************************************************************************
***** For some reason frequencies automatically adjusted to minimum freq *****
******************************************************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (10)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (13)

*********************************************************
***** No longer able to change frequencies manually *****
*********************************************************
root@tails:/home/jrt# for i in 0 1 ; do echo 2501000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq ; done
root@tails:/home/jrt# for i in 0 1 ; do echo 2501000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq ; done
bash: echo: write error: Invalid argument
bash: echo: write error: Invalid argument

****************************************
***** Frequencies remain unchanged *****
****************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (10)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (13)

*********************************
***** Unplug AC power again *****
*********************************
root@tails:/home/jrt# cat /proc/acpi/ac_adapter/AC/state
state:                   off-line

**************************************************************************
***** Frequencies remain the same but governor automatically updated *****
**************************************************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (10)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 800 MHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (13)

**************************************************
***** Attempt to manually change frequencies *****
**************************************************
root@tails:/home/jrt# for i in 0 1 ; do echo 2501000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_max_freq ; done
root@tails:/home/jrt# for i in 0 1 ; do echo 2501000 > /sys/devices/system/cpu/cpu$i/cpufreq/scaling_min_freq ; done

***************************************************************
***** Frequencies accepted (but only on battery power???) *****
***************************************************************
root@tails:/home/jrt# cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@lists.linux.org.uk, please.
analyzing CPU 0:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (23)
analyzing CPU 1:
  driver: acpi-cpufreq
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 800 MHz - 2.50 GHz
  available frequency steps: 2.50 GHz, 2.50 GHz, 2.00 GHz, 1.60 GHz, 1.20 GHz, 800 MHz
  available cpufreq governors: conservative, ondemand, userspace, powersave, performance
  current policy: frequency should be within 2.50 GHz and 2.50 GHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency is 2.50 GHz (asserted by call to hardware).
  cpufreq stats: 2.50 GHz:0.00%, 2.50 GHz:0.00%, 2.00 GHz:0.00%, 1.60 GHz:0.00%, 1.20 GHz:0.00%, 800 MHz:0.00%  (25)
root@tails:/home/jrt# exit

Script done on Fri 03 Jul 2009 12:55:48 PM CEST