Good drivers black screen issue seems to be fixed..no issues so far in Firefox and Thunderbird, even with vsync off
I see a nice performance increase in UT2k4 ran with ~stat fps
Also a great score with Heaven 2.1 almost as good as Win 7 dx 11 normal tess.

Code:
Unigine
Heaven Benchmark v2.1
FPS:	
19.3
Scores:	
485
Min FPS:	
4.1
Max FPS:	
52.6
Hardware
Binary:	
Linux 64bit GCC 4.3.2 Release May 20 2010
Operating system:	
Linux 2.6.35.4-desktop-nrj.69mib x86_64
CPU model:	
AMD Phenom(tm) II X3 720 Processor
CPU flags:	
3214MHz MMX+ 3DNow!+ SSE SSE2 SSE3 SSE4A HTT
GPU model:	
ATI Radeon HD 5700 Series 4.0.10188 Compatibility Profile Context 1024Mb
Settings
Render:	
opengl
Mode:	
1920x1080 fullscreen
Shaders:	
high
Textures:	
high
Filter:	
trilinear
Anisotropy:	
16x
Occlusion:	
enabled
Refraction:	
enabled
Volumetric:	
enabled
Replication:	disabled
Tessellation:	
normal