How can I optimize Ubuntu for minimal energy usage? I use my laptop for development, but also for writing. I have a 9 hour flight coming up and a 6 hour battery life when already using

• limited screen brightness


• no usb devices


• no networking


• bumblebee installed and the nvidia card switched off


• TLP set on powersave

How can I now increase my battery life knowing that I only want to write (using LibreOffice)? I essentially want a very minimal system for a sort of 'writing mode.'

• Should I limit my quadcore to one core?



• Should I disable some services? Here is the list of service --status-all

  
  
  

  [ + ]  acpid
  
  [ + ]  anacron
  
  [ + ]  apache2
  
  [ - ]  apparmor
  
  [ ? ]  apport
  
  [ + ]  atd
  
  [ + ]  avahi-daemon
  
  [ ? ]  binfmt-support
  
  [ + ]  bluetooth
  
  [ - ]  brltty
  
  [ + ]  bumblebeed
  
  [ + ]  console-font
  
  [ + ]  console-setup
  
  [ + ]  cron
  
  [ + ]  cups
  
  [ + ]  cups-browsed
  
  [ - ]  dbus
  
  [ ? ]  dns-clean
  
  [ - ]  elasticsearch
  
  [ - ]  fancontrol
  
  [ + ]  friendly-recovery
  
  [ - ]  grub-common
  
  [ ? ]  irqbalance
  
  [ - ]  kerneloops
  
  [ ? ]  killprocs
  
  [ + ]  kmod
  
  [ ? ]  lightdm
  
  [ - ]  lighttpd
  
  [ - ]  lm-sensors
  
  [ ? ]  mysql
  
  [ ? ]  networking
  
  [ + ]  nmbd
  
  [ ? ]  ondemand
  
  [ - ]  openvpn
  
  [ + ]  postgresql
  
  [ ? ]  pppd-dns
  
  [ + ]  prey-trigger
  
  [ - ]  procps
  
  [ - ]  pulseaudio
  
  [ ? ]  rc.local
  
  [ + ]  resolvconf
  
  [ + ]  rfkill-restore
  
  [ + ]  rfkill-store
  
  [ - ]  rsync
  
  [ + ]  rsyslog
  
  [ + ]  samba
  
  [ + ]  saned
  
  [ - ]  selfcontrol
  
  [ ? ]  sendsigs
  
  [ + ]  setvtrgb
  
  [ - ]  smartmontools
  
  [ + ]  smbd
  
  [ ? ]  speech-dispatcher
  
  [ - ]  sudo
  
  [ - ]  timidity
  
  [ ? ]  tlp
  
  [ - ]  udev
  
  [ ? ]  umountfs
  
  [ ? ]  umountnfs.sh
  
  [ ? ]  umountroot
  
  [ - ]  unattended-upgrades
  
  [ - ]  urandom
  
  [ + ]  winbind
  
  [ - ]  x11-common
  
  

  
  
  
  
  
  • Should install a more lightweight desktop environment? Can I do this in a nice and clean way (after all I have my laptop nicely set up and do not want to have to reinstall before 14.04).
  
  
  • Should I do something else?
  
  

One last thing: I would like to activate or deactivate all these options with one script (which I will run only when working on battery). Please be as kind as to include suggestions on how to do what you suggest.

PS: the info in some of the possible duplicates is dated for 13.10.