Created attachment 89062 [details]
Xorg.0.log

lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] RV350 [Radeon 9550] [1002:4153]

/usr/lib/nux/unity_support_test -p
OpenGL vendor string:   VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.3, 128 bits)
OpenGL version string:  2.1 Mesa 9.2.1

Not software rendered:    no
Not blacklisted:          yes
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      yes
GL vertex buffer object:  yes
GL framebuffer object:    yes
GL version is 1.4+:       yes

Unity 3D supported:       no

>From Xorg.0.log
(--) RADEON(0): Chipset: "ATI Radeon 9600 AS (AGP)" (ChipID = 0x4153)

RV350 listed as fully supported by Ubuntu at 
https://help.ubuntu.com/community/RadeonDriver (August 2013)
but is not found in Xorg.0.log

I also tried using MESA 10.* but no change.

What am I missing?  Thank you