转载：DriTroubleshooting

如果感觉显卡的DRI功能不正常，可参考这个网页来排错。

http://dri.freedesktop.org/wiki/DriTroubleshooting

亮点：

DRM

Check that the DRM (Direct Rendering Module, the kernel module) is loaded and has found your card. Do dmesg | grep drm. You should have several lines of info, with samples below:

FreeBSD:

drm0: <ATI Radeon QL R200 8500 LE> port 0x9000-0x90ff mem 0xed000000-0xed00ffff,0xe0000000-0xe7ffffff irq 10 at device 0.0 on pci1

info: [drm] AGP at 0xe8000000 64MB

info: [drm] Initialized radeon 1.9.0 20020828 on minor 0

info: [drm] Loading R200 Microcode

Linux:

[drm] AGP 0.99 on Intel i815 @ 0xe8000000 64MB

[drm] Initialized radeon 1.1.1 20010405 on minor 0