求助：etch 下安beryl失败！

hedaors

按照网上的教程装完后，运行 beryl-manager后，出现
Xlib:  extension "XFree86-DRI" missing on display ":0.0".
XGL Absent, checking for NVIDIA
Nvidia Absent, assuming AIGLX
Xlib:  extension "XFree86-DRI" missing on display ":0.0".
beryl: glXBindTexImageEXT is missing
beryl: Failed to manage screen: 0
beryl: No manageable screens found on display :0.0

请问这是为什么啊？我是ati显卡。3d驱动已装。