AMD RadeonSI Graphics Driver Still Troublesome On Linux

First, here's the rundown of the system hardware / software as described on the previous page:

All of the open and closed-source Linux OpenGL graphics driver benchmarks in this article were handled in a fully-automated manner using the Phoronix Test Suite software and are accessible for collaborative benchmarking, validation of benchmark results, and viewing of system logs and more via OpenBenchmarking.org.