Run GUI as root : Xlib: extension "RANDR" missing on displa

[HUN_Csab_Pi]

Dear Forumers,

(First of all I'm beginner in Pi therefore the solution can be easy, but unfortunatelly for me it seems too difficult.)

So, I need support regarding the following problem:
I trying the Pi GPIO functions (blinking, pwm RGB Led) and I created a GUI for it in Qt.

The problem:
If I want to reach the GPIO, I have to run my GUI as root (as far as I know).
When I start the py code with gksudo, I get an error message:
Xlib: extension "RANDR" missing on display ":1"
I tried to find solution via google, but unfortunatelly I couldn't solve it. Maybe this problem related to tightvnc server?

My questions would be the following:
-Should I use another vnc server? (If yes, which vnc server is preferred)
-If it solvable with tightvnc, how?
-If it is not tightvnc related problem, how can I solve it?

Thank you very much in advance,
csab

Sorry for my poor English.

[DougieLawson]

Ignore the randr message it's not a problem it's simply because of the lack of function in the xwindows server because the hardware can't support it.

[HUN_Csab_Pi]

Dear Dougie,

Thank you the fast answer.
If I comment the GPIO functions in my code, the GUI start without problem.
If I uncomment the GPIO functions and run it with gksudo, then the GPIO functions works during the start (__init__) ,but unfortunatelly I see only the main frame. The full content is missing inside the GUI. It seems like a frozen window.

Csab