You should see some output like
$ fgl_glxgears
Using GLX_SGIX_pbuffer
66 frames in 5.0 seconds = 13.200 FPS
.
.
.
if it is running. If it is on display adapter of the monitor screen it will also pop-up a window with madly spinning gears.
You can change adapters which run the code by doing the
$export DISPLAY=:0.X ; fgl_glxgears
where X is the adapter you want to run on .... (0 is normally the default display adapter attached to the screen but hard to know without knowing you set-up config, etc).
Didn't get anything on running it passed the "Using GLX_SGIX_pbuffer"
But to be honest I don't think the thing is honoring the sub display number or the driver is still trying for all cores. I used both "export DISPLAY=:0.0" and "fgl_glxgears -display :0.0" and both hang just the same, but if I *remove* the crippled card from the system it runs perfect. I'm guessing it is trying to access everything on bootstrapping and hangs?