Hi Przemek,

Initially I was not aware of the X server. With a detailed study about X 
server and X window system, I could solve this issue.
Thank You for the information and help.

Thanks & Regards,


On Wednesday, February 15, 2017 at 10:00:01 PM UTC+5:30, Przemek Klosowski 
> On Wed, Feb 15, 2017 at 12:23 AM, sajeevan k <saje...@laxven.com 
> <javascript:>> wrote: 
> > I stated the X server with startx command. 
> > Also now a default display is coming in the LCD display(which may be the 
> > BBB's default display) 
> That's good. I don't know about the erorrs---it looks like the GL 
> software rendering is turned off but simple X should work now. 
> > Now I tried to run a simpleQt program, by opening another terminal. But 
> it 
> > is only showing the following message in the terminal. 
> > 
> >  root@localhost:~# ./simpleQt 
> > QXcbConnection: Could not connect to display 
> Are you doing that from the same terminal as the one you ran startx 
> from? What is the value of the DISPLAY environment variable? 
> Try doing 
> DISPLAY=:0 ./simpleQt 

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