Chipset status for Xorg wiki page

[archibald]

I figured this was intended for everybody to test and contribute,
so here's my initial result, I'll send more shortly.

archibald

AMD/ATI Chipset RV770 (Radeon HD 4850)

Status with new xorg (xserver 1.10, mesa 7.11): Works

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$ glxinfo | grep OpenGL
IRQ's not enabled, falling back to busy waits: 2 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: Mesa DRI R600 (RV770 9442)  TCL
OpenGL version string: 2.1 Mesa 7.11.2
OpenGL shading language version string: 1.20
OpenGL extensions:
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