• Install Jupiter and jupiter-support-eee. This is a frontend to the acpi power states and works by undervolting the CPU and Mainboard. It will reduce power consumption at the price of preformance of course.

  
  
  

  sudo add-apt-repository ppa:webupd8team/jupiter
  
  sudo apt-get update
  
  sudo apt-get install jupiter jupiter-support-eee
  
  




• reduce the backlight as far as possible. This may sound obvious, but helps a lot!




• disable bluetooth https://askubuntu.com/a/2568/34029




• check that the hda-intel power saving mode is active. The current generation onboard audio (often called "High Definition" or HDA) has power savings capabilities that are supported via the ALSA drivers

  
  
  

  To check if power save is enabled for the HDA controllers, use:

  
  
  

  # cat /sys/module/snd_hda_intel/parameters/power_save
  
  10
  
  

  
  
  

  Power saving is enabled if the value that this shows is greater than zero. Some more tweaks for the HDA-intel module:

  
  
  

  sudo sh -c 'echo Y > /sys/module/snd_hda_intel/parameters/power_save_controller'
  
  sudo sh -c 'echo 1 > /sys/module/snd_hda_intel/parameters/power_save'
  
  




• USB auto power/suspend

  
  
  

  sudo sh -c 'for i in /sys/bus/usb/devices/*/power/level; do echo auto > $i; done'
  
  sudo sh -c 'for i in /sys/bus/usb/devices/*/power/autosuspend; do echo 1 > $i; done'
  
  




• PCI auto power/suspend

  
  
  

  sudo sh -c 'for i in /sys/bus/pci/devices/*/power/control; do echo auto > $i; done'
  
  




• Set SATA link Power management to min_power

  
  
  

  sudo sh -c 'for i in /sys/class/scsi_host/host*/link_power_management_policy; do echo min_power > $i; done'
  
  




• blacklist the brcmsmac wifi driver because it does not support power saving. the proprietary wl driver from broadcom does.

  
  
  

  gksudo gedit /etc/modprobe.d/blacklist.conf
  
  

  
  
  

  Add these lines at the end of the file to prevent the kernel drivers from loading

  
  
  

  blacklist bcma
  
  blacklist brcmsmac
  
  blacklist brcmutil
  
  

  
  
  

  Now install the proprietary driver via the "Restricted Drivers manager" or from the terminal

  
  
  

  sudo apt-get install bcmwl-kernel-source
  
  

  
  
  

  and reload the wlan drivers or reboot. To enable power saving with:

  
  
  

  sudo iwconfig eth1 power on  
  
  

  
  
  

  set timeout to 500ms

  
  
  

  sudo iwconfig eth1 power timeout 500ms
  
  

  
  
  

  Reduce adapter power to 5

  
  
  

  sudo iwconfig eth1 txpower 5
  
  




• Use powertop to see which programs are doing unneeded background processing https://askubuntu.com/a/98367/34029




• Fan: the fanspeed is set by the bios. I really suggest not to mess with it because you can cause hardware damage if you misconfigure it. If you want to change this anyway see http://www.tjansson.dk/?p=325

When following this tips you can get the laptop down to 670-700 mAh resulting in ~ 6,5 hours of runtime on battery.