Comment # 7 on bug 1202850 from Stefan Dirsch

It tries to load the software rasterizer. This is weird.

Try this

  dri_driver=iris strace -f -e trace=file glxinfo -B 2>&1|grep _dri

Should look like this.

ATTENTION: default value of option dri_driver overridden by environment.
openat(AT_FDCWD, "/usr/lib64/dri/tls/iris_dri.so", O_RDONLY|O_CLOEXEC) = -1
ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib64/dri/iris_dri.so", O_RDONLY|O_CLOEXEC) = 5
ATTENTION: default value of option dri_driver overridden by environment.

Try also with "i965" and "crocus" as drivers instead of "iris".