Intel Broadwell/Skylake Graphics Performance For Steam Linux Gaming

Complementing yesterday's Are The Open-Source Graphics Drivers Good Enough For Steam Linux Gaming? article is a look at the Steam Linux gaming performance for three different Intel Linux systems running Ubuntu 15.10 and firing up the latest Steam client. This is the last of the planned series that began one week ago with the a 22-way comparison of NVIDIA/AMD GPUs on SteamOS.