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前段时间装了驱动进不到桌面，改回来之后再次尝试安装，可是那个安装说明实在是简单，我这个绝对新手照着做，每次都是失败。又找了一个介绍怎么启用XGL的，这个很详细，我弄成功了并且改了一下，发上来给大家参考一下。
P.S:可能是我的9550太不行了，系统提示说：Xgl已启用，但不能很好地与这张卡共用。要禁用 Xgl 并返回到 2D 桌面，请按下面的“禁用桌面效果”。这将使您注销并返回到登录屏幕。 不过好在学会了怎么开启XGL了。
1. 先将make、gcc、kernel-source、xgl、compiz全部安装好
2.到http://www.ati.com/support/driver.html 下载对应你系统架构驱动。
3.在终端执行命令。下面是我执行的命令：
lovemai.kuraki@Aurea:~> ./ati-driver-installer-8.35.5-x86.x86_64.run
Created directory fglrx-install.T11528
Verifying archive integrity… All good.
Uncompressing ATI Proprietary Linux Driver-8.35.5
==================================================
ATI Technologies Linux Driver Installer/Packager
==================================================
Detected configuration:
Architecture: i686 (32-bit)
X Server: X.Org 6.9.x
Removing temporary directory: fglrx-install.T11528
lovemai.kuraki@Aurea:~> su
口令：
Aurea:/home/lovemai.kuraki # ./ati-driver-installer-8.35.5-x86.x86_64.run
Created directory fglrx-install.A13503
Verifying archive integrity… All good.
Uncompressing ATI Proprietary Linux Driver-8.35.5
==================================================
ATI Technologies Linux Driver Installer/Packager
==================================================
Detected configuration:
Architecture: i686 (32-bit)
X Server: X.Org 6.9.x
Removing temporary directory: fglrx-install.A13503
Aurea:/home/lovemai.kuraki # sax2 -r -m 0=fglrx
SaX: initializing please wait…
SaX: your current configuration will not be read in
SaX: access to your display has been granted
SPP: prepare device [0] profile: FireGL
SPP: including prepared profile(s)…
SaX: startup
SaX: X-Server: :0.0 -> grant
SaX: using cache data…
Aurea:/home/lovemai.kuraki #
4.在次登录，打开终端运行命令gnome-session-properties（控制中心－系统－会话）
见到弹出的界面之后，点击“启动程序”选项卡；
点击“添加”按钮，在对话框里面输入compiz –replace gconf
再此点击添加按钮，在对话框里面输入gnome-window-decorator
5.回到终端控制器，输入如下命令gconf-editor
此时会弹出配置编辑器窗口，在左侧面板，按照如下次序依次打开每个折叠项。
apps -> compiz -> general -> allscreens -> options
打开之后，在右侧面板双击active_plugins项。确保下列compiz插件设置并加载:
gconf, decoration, wobbly, fade, minimize, cube, rotate, zoom, scale, move, resize, place, switcher, water如果其中一些项目没出现的话，则需要手动添加进去。确定所有插件都已经设置并且加载之后，注销，重新登录。
6.登录后，打开gnome控制中心，选择“桌面效果”，然后点击“启用桌面效果”。注销，登录，OK！
