Linux: Laptop Power Saving Tips: White on Black, Put Machine to Sleep

when using a laptop under bright sunlight, it's often better to have black screen, like in Terminal screen.

• For emacs, start it like this: emacs -rv
• For Firefox, you can install a add-on. Search for “firefox invert colors add-on”. Or this: https://addons.mozilla.org/en-US/firefox/addon/blank-your-monitor-easy-readin/
• For Google Chrome, use Google official extension “High Contrast” at https://chrome.google.com/webstore/detail/djcfdncoelnlbldjfhinnjlhdjlikmph

It's also a good idea to set your desktop background to completely black or some dark image.

If you are using Linux, use Xfce or LXDE as your desktop. They are less power hungry than {Unity, Gnome, KDE}. 〔☛ Linux: How to Install New Window Manager (Gnome, KDE, Xfce, xmonad, …)〕

See also: Linux: Command Line to {Shutdown, Restart, Sleep, Hibernate}