Unity really needs an easy inbuilt "presention mode" where you could either hit a key combination or use an inbuilt indicator to completely indicate screensaver/screen blanking/suspend. There are many use cases for this, such as watching videos.
Of course some applications are smart enough to do this themselves, but the problem is: 1. Not all applications do this. 2. Gnome changes the method to do this so often that the applications that can often have this function broken anyway. And then there are other common use cases that have never and will never be able to do it by themselves, such as adobe flash player. I'm aware of the caffeine indicator, but this project doesn't seem to have had any activity for two years and doesn't seem to work properly in gnome 3.6. Simply having a inbuilt keyboard shortcut to inhibit this until its pressed again would be very useful to many users, and a great failsafe for use cases such as applications that can't do it on their own. Having the screen turn off in the middle of doing something is one of the most annoying experiences a user can have!
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