Ubuntu 16.04 with AMD 280x and mesa 13.1.0-devel
Short description of error
Blender UI is artifacting badly when hovering over UI elements or rotating 3d view.
Solved by launching with the command LIBGL_DRI3_DISABLE=1 blender or in blender to Blender User Preferences - System - Window Draw Method and change to Triple Buffer.
Freedesktop bug report: https://bugs.freedesktop.org/show_bug.cgi?id=97059
Exact steps for others to reproduce the error
Use AMD and mesa drivers
Start blender with Window Draw Method set to automatic.
UI should have bad artifacting.
Change Window Draw Method to Triple Buffer
No UI problems