Depends if you're using 32 bits programs (requiring a package of 32libs) or not.
For me it is (for you it might not have the lib32 directory): paulo@AIVAS:~$ echo $LIBGL_DRIVERS_PATH /usr/lib/dri:/usr/lib32/dri
I have no idea about the other problems or how you can have rendering without this variable (i hadn't).
Depends if you're using 32 bits programs (requiring a package of 32libs) or not.
For me it is (for you it might not have the lib32 directory): dri:/usr/ lib32/dri
paulo@AIVAS:~$ echo $LIBGL_DRIVERS_PATH
/usr/lib/
I have no idea about the other problems or how you can have rendering without this variable (i hadn't).