Intel Iris Graphics 5100: Windows 8.1 vs. Ubuntu 14.04 Linux

While the Unigine tests normally work fine on the latest Intel Linux graphics driver for Haswell and Ivy Bridge, the tests would fail outright with Iris Graphics 5100. Unigine Heaven and Valley would at least initialize and run, but the screen would be completely white during testing. With my most recent testing of HD Graphics 4600, this wasn't the case.

Xonotic with low image quality settings yielded performance results on Ubuntu 14.04 that were slower than Microsoft Windows 8.1 but not as bad as the Nexuiz performance.