Comment 175 for bug 121653

David:

You can open a terminal window and run the "fglrxinfo" command. If you get this:

display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Mobility Radeon X1400
OpenGL version string: 2.0.6958 Release

then your 3D acceleration is working. If the OpenGL vendor string says something about Mesa, then your acceleration isn't working.