Comment 1 for bug 23861

Additional information:

lgb@oxygene:~$ glxinfo
name of display: :0.0
Illegal instruction

lgb@oxygene:~$ LIBGL_DEBUG=verbose glxinfo
name of display: :0.0
libGL: XF86DRIGetClientDriverName: 1.2.0 mga (screen 0)
libGL: OpenDriver: trying /usr/lib/dri/mga_dri.so
drmOpenByBusid: Searching for BusID pci:0000:01:00.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 4, (OK)
drmOpenByBusid: drmOpenMinor returns 4
drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0
libGL error:
Can't open configuration file /etc/drirc: No such file or directory.
libGL error:
Can't open configuration file /home/lgb/.drirc: No such file or directory.
Illegal instruction

lgb@oxygene:~$ gdb glxinfo
[...]
run
Program received signal SIGILL, Illegal instruction.
[Switching to Thread -1213442368 (LWP 8407)]
0xb78ad4fc in mgaInitState () from /usr/lib/dri/mga_dri.so
(gdb) bt
#0 0xb78ad4fc in mgaInitState () from /usr/lib/dri/mga_dri.so
#1 0xb78ec93e in mgaFreeVB () from /usr/lib/dri/mga_dri.so
#2 0xb78a59a6 in __driUtilMessage () from /usr/lib/dri/mga_dri.so
#3 0xb7ed128a in __glFillMap2d () from /usr/lib/libGL.so.1
#4 0xb7ed1599 in glXCreateContext () from /usr/lib/libGL.so.1
#5 0x080490ee in ?? ()
#6 0x0804d008 in ?? ()