==== Vendor specific ====
=== Radeons with EXA support (9700 - HD6000) ===
  * Set ''Option "DRI" "3"'' in Xorg.conf
  * you can check DRI3 in Xorg.log
=== Radeon with GLAMOR support (HD6000 - latest) ===
  * Set ''Option "DRI" "3"'' in Xorg.conf
  * for the HD **6000** series you may want enable '' Option          "AccelMethod" "glamor" '' in your xorg.conf files for getting better performance
  * Look for ''DRI3 enabled'' in Xorg.log
  * The Radeon DDX was recently updated with vsync support with DRI3, so you should have no issues now.
=== nVidia ===
  * DRI3 is enabled by default when using glamor as of nouveau DDX version 1.0.11, but it is buggy currently (imirkin)
==== How to verify that DRI3 is running? ====
  * this will work only for Mesa-3D with **[[d3d9_debugging|debug]]** enabled OR libgl1-mesa-glx-dbg package on Ubuntu!
  * run glxgears or any simple application with ''**gdb app_name**''
  * ''**break dri3_swap_buffers**'' will set a breakpoint in dri3_swap_buffers
  * Answer **y** to //Function "dri3_swap_buffers" not defined.//
  * ''**run**'' and it **should stop** at this function. If it doesn't, you're **not** using DRI3 OR you compiled with --disable-dri3 for VSync. If it's the latter, this is expected and everything should still work.