Intel Graphics + Xonotic have a few problems
I think there are some problems with the Intel HD Graphics. I created some screenshots, and a description for each one.
Picture "1": Explosions caused from every kind producing textures with a black frame around it.
Picture "2": The edge from water to another material have black artifacts.
Picture "3": Grass texture is extremely blurred.
Picture "4": Weapons textures are also blurred.
Picture "5": The reflexion of the player in the water produces artifacts.
Picture "6": Here again the water.
Picture "7": The most textures are also fuzzy if you go closer to them.
Picture "8": Textures of models from this kind are also a bit fuzzy.
Picture "9": Here another model/vehicle which textures are fuzzy.
Infos:
CPU: Intel® Core™ i5-3570
GPU: Intel HD Graphics 2500
OS: Fedora Linux 23 (newest Intel Graphics / Mesa Drivers installed)
Using the graphics mode "Ultra".
In general, if you look closer to textures, they are extremely fuzzy.
All this was not the case with my old NVIDIA Graphics Card (I also reinstalled my OS, there should be no issues from this kind).
Tested on different maps, multiplayer and singleplayer