The multiple monitor experience on Linux traditionally was very arcane and difficult; it would involve editing text configuration errors, trial-and-error, picking the right Linux GPU driver, and various other steps to get a working multi-monitor desktop. Since then there's been RandR 1.2+ and major improvements to all of the important Linux desktop graphics drivers -- both open and closed-source. How is the Linux multi-monitor now when using a modern distribution and the latest graphics cards that can drive four monitors simultaneously? Let's find out! Up for testing today are NVIDIA and AMD graphics cards using both the open and closed-source drivers while using DVI, DisplayPort, and HDMI displays.