[osg-users] GraphicContext null

[Pete Black]

This  may be due to the fact that Fedora now runs gdm on its own screen.

e.g. it used to be that you could more or less assume setting DISPLAY=:0 and running an X11 application would show the app on the machines 'local' display. With Fedora 22+ this is now DISPLAY=:1

It looks to me, after glancing at the window setup code, that the Traits used to configure a 'single screen' will default to 0 as the screen number, and thus fail to create the context, as the logged-in user is not authed to create resources on the gdm screen.

I only use Qt-created windows in my app so I can't be sure about this but it corresponds very well with the confusion I encountered trying to launch X11 apps on the 'local' display when ssh-ing into a remote Fedora machine.

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