Problem with Enabling DRI

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 From http://dri.freedesktop.org/wiki/DriTroubleshooting:
'If it says:
[drm] drmSetBusid failed (7, PCI:1:0:0), Permission denied
people have said that it's because the modules were built with a different  
gcc version than the kernel. Make sure they are in sync. Also, dmesg  
output should show something about version magic mismatches if this is the  
case. Another possibility (for the i915/i810 chipsets) is that you have an  
old buggy version of the i810 driver. Be sure to upgrade to the latest and  
"greatest".'
Maybe it will help.