kernel video option

1. Framebuffer:
用 vesafb ，别的 xxfb 都不要。只留 vesafb ，还不能是 m 。

2.xorg rendering:

Processor type and features --->
<*> MTRR (Memory Type Range Register) support
Character devices --->
<M> /dev/agpgart (AGP Support)
[M] SIS... support
(Enable your chipset instead of the above.)
< > Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
**注意我这里还是要"M"后xorg才有"rendering enabled"
（看网上说的不要选，我想可能是指使用ATI官方驱动的时候吧？）
(Make sure the Direct Rendering Manager (DRM) is off. The X11-DRM package will provide its own.)

还有xorg7.1的driver里xf86-video除了ati还要编译chips才行。(rendition那个我也编译了)
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