Open sourcers are furious that while Nvidia's GeForce GTX 900 series is a dominant card for Linux gamers it is about as open source friendly as an Apple fanboy who has been queuing for two months for the latest pointless tool he cant use.
The GeForce GTX 900 has excellent performance and great Linux OpenGL/OpenCL performance but only when using the proprietary driver. Rather than becoming more open sauce friendly Nvidia's newer GTX 900 / Maxwell hardware more hostile to the weirdie beardie open sauce extremists.
According to Phoronix the Linux 3.19 kernel had basic support for the new Nvidia GPUs in the open-source, community-based, reverse-engineered Nouveau driver.
But this was restricted to mode-setting and not hardware acceleration. Nvidia's move to requiring signed firmware images for their graphics processors is biting the open-source developers.