Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
I recently discovered a very useful tool: xrandr. This command allows you to reset your screen resolution, which comes in very handy when some buggy app changes you screen resolution and doesn't set it back. It saves logging out and in again or even having to use Ctrl + Alt + Backspace!
To set your screen resolution back to normal, use xrandr like this: