Public bug reported:

OpenGL applications hang on Edgy (2006-09-29), though earlier ones did two.
Xorg.0.log claims DRI is enabled
Running glxinfo or glxgears results in the application hanging. In the case of 
glxinfo:

strace glxinfo
....
gettimeofday({1159548938, 955903}, NULL) = 0
write(3, "\217\3\6\0\4\0\340\2$\0\0\0\0\0\0\0\0\0\0\0\1B_d\200\7"..., 36) = 36
read(3, "\1\371\31\0\0\0\0\0\0\0\0\0\0\0\0\0\250i\265\277+\274\274"..., 32) = 
32write(3, "\200\t\3\0\0\0\0\0\2\0\340\2", 12) = 12
read(3, "\1i\32\0\1\0\0\0\0\0\0\0\4\5\0\0\0\0\0\0d\0d\0\0\0\0\0"..., 32) = 32
read(3, "\0\0\0\0", 4)                  = 4
futex(0xb7fa2870, FUTEX_WAKE, 2147483647) = 0
ioctl(4, 0x4008642a <unfinished ...>

(fd 4 is /dev/dri/card0)

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

-- 
Edgy: Matrox G400 OpenGL "hangs"
https://launchpad.net/bugs/63015

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