However, Valve notes the fact that enabling hardware acceleration on NVIDIA GPUs may cause X11 to crash. As such, hardware acceleration will be disabled by default for NVIDIA systems. In addition, Valve says that DPI scaling may not work correctly when hardware acceleration is disabled.
What happened to Nvidia open sourcing their graphics driver last year? It seems like nothing came out of it. I know the userland is still closed, but wasn't there an effort to include the driver in Mesa?