I see a missing part of the scene when playing Scorched3d. It is triangle shaped region originating from the bottom of the window. It only happens when using KMS. UMS renders fine. I am using xorg 1.7.7, mesa 7.8.1, radeon driver 6.13, kernel 2.6.34.
Oh, the card is Radeon HD 4350, OpenGL renderer string: Mesa DRI R600 (RV710 954F) 20090101 x86/MMX+/3DNow!+/SSE2 TCL
Created attachment 36762 [details]
The missing area is even larger with Mesa 7.9-rc2, kernel 2.6.35, radeon driver 6.13.2.
Still a problem with Mesa 7.10, kernel 126.96.36.199, radeon driver 6.13.99
Please try with r600g, the classic driver is no longer actively supported
With R600g, Mesa 8.0rc2 it looks much better, the triangle is not missing and there are much more scene details and bugs fixed.