[$] Status updates for three graphics drivers

Drivers for graphics hardware are an important part of the graphics stack,so it was not unexpected that the 2015 X.Org DevelopersConference had several status updates for free graphics drivers. Threeprojects had talks: theNouveau driver forNVIDIA devices, the amdgpu driver for AMDhardware, and the Etnaviv driver forVivante GPUs. Each presented an update on its progress and plans.