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Checking for Xgl: not present.
Detected PCI ID for VGA: 01:00.0 0300: 1002:71c5 (prog-if 00 [VGA controller])
Checking for texture_from_pixmap: not present.
Trying again with indirect rendering:
Checking for texture_from_pixmap: present.
Checking for non power of two support: present.
Checking for Composite extension: present.
Comparing resolution (1280x800) to maximum 3D texture size (4096): Passed.
Checking for nVidia: not present.
Checking for FBConfig: present.
Checking for Xgl: not present.
/usr/bin/compiz.real (video) - Warn: No 8 bit GLX pixmap format, disabling YV12 image format
Couldn't find a perfect decorator match; trying all decorators
Found no decorator to start
Attempted to unregister path (path[0] = org path[1] = freedesktop) which isn't registered
Attempted to unregister path (path[0] = org path[1] = freedesktop) which isn't registered
Attempted to unregister path (path[0] = org path[1] = freedesktop) which isn't registered

ccsm里面有个使用桌面管理器装饰的吧。很久没看了。就是不使用emerald的，打勾的地方。

我没有卸载也没启动成功 只好暂时metacity
也是N卡

搞定了，错误信息大致是没有找到窗口的启动器或者发生器之类的意思。估计相当于没有驱动。
在新立得里面搜索compiz，把compiz的两项介绍中包含decrator 的选中，装上就好了。

卸载emerald会把emerald的decrator卸载，所以无法开启3D。

但是装上compiz for gnome和另外一个compiz 什么就可以了。