Kubuntu 14.04 - GTX 960 - i7-3770
Broken: From master , 57a0cb797d
Short description of error
Some tiles remain noisy with new CPU+GPU render from master
Exact steps for others to reproduce the error
Download blender from master, from user prefferences configure it to render using GPU + CPU at the same time. You make sure to be using small tiles (in case you have auto tile size addon) and render the scene.