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how to export display environment in root user ?



Hi,

When I am login with the root user in beagle bone black, I can't export display environment variable and also not able to use xset  dpms force off  command.

I am getting No protocol specified xset  and   unable to open display ":0.0" error.

But I am not getting  this error in the with debian login.

Thanks

Regards

Parth