Hi, 
glewinfo (and glxinfo) without DISPLAY=:0 both work. (but they give me the info of my local machine. The graphics card info is the local one not the remote one, openGL version is 2.1.2 and display is localhost:10.0.  glxinfo produces the same error as glewinfo when using DISPLAY=:0. 

My xorg.conf has the same format as the sample one, with the exceptions that I have a single monitor/screen/device. I'll try with the double configuration.

Yeah, I see the  "[    41.772] (II) Loading extension GLX" log entry

X is running when the machine restarts. running  "sudo /usr/bin/X :0 &amp;"  yields: 
"Fatal server error:
Server is already active for display 0
If this server is no longer running, remove /tmp/.X0-lock
and start again." 

I also see /user/bin/X under list of current processes. 


Any other idea of what to try?
Thanks