遭遇ATI显卡无法使用Xv的问题
授权方式：署名，非商业用途，保持一致，转载时请务必以超链接(http://www.fwolf.com/blog/post/224)的形式标明文章原始出处和作者信息及本声明。机器：P D 3.2的cpu
OS：Ubuntu dapper 6.06 2.6.15-26，i686内核
显卡：ati X600 256M显存，双头
软件环境：totem-xine, mplayer, w32codecs都安装了
问题：能够正常进入X，能够玩opengl游戏，但是一播放电影就不行了，X崩溃重启，回到图形登录页面。glxinfo和fglrxinfo（注意fps有一个突变，不知为何）：
glxinfo
16914 frames in 5.0 seconds = 3382.795 FPS
16917 frames in 5.0 seconds = 3383.297 FPS
16774 frames in 5.0 seconds = 3354.716 FPS
48706 frames in 5.0 seconds = 9741.081 FPS
52345 frames in 5.0 seconds = 10466.271 FPS
51773 frames in 5.0 seconds = 10350.462 FPS
52214 frames in 5.0 seconds = 10442.764 FPS
16914 frames in 5.0 seconds = 3382.795 FPS
16917 frames in 5.0 seconds = 3383.297 FPS
16774 frames in 5.0 seconds = 3354.716 FPS
48706 frames in 5.0 seconds = 9741.081 FPS
52345 frames in 5.0 seconds = 10466.271 FPS
51773 frames in 5.0 seconds = 10350.462 FPS
52214 frames in 5.0 seconds = 10442.764 FPS
fglrxinfo
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: RADEON X600 Generic
OpenGL version string: 2.0.5814 (8.25.18)
崩溃后的信息为：
Fata Server Error
Caught Signal 11, Server aborting
Caught Signal 11, Server aborting
查询网络后，有两个解决方法，都要手动修改xorg.conf，第一种是禁用extmod，第二种是禁用Xv，改用opengl。
禁用extmod则注释掉Load “extmod”这一句就可以了。
禁用Xv需要把Xv设为off，opengl设为on，修改Section “Device”：
Option “VideoOverlay” “off”
Option “OpenGLOverlay” “on”
Option “OpenGLOverlay” “on”
个人觉得第二种方法稍微好一些，不过也是戳子里面拔将军，沒有解决实际问题，并且用mplayer播放电影的时候，启动和结束程序还会黑一下屏。
使用opengl以后fps从12000降到了8000多，所以Xv还是要更快一些的，不过我也不怎么玩游戏，无所谓了，没准等以后fglrx驱动或者xorg升级了就能解决这个问题。
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