Extension RANDR missing on display 1.0

hello everyone,
i have problem when i try to open the GopiGO control panel , the terminal opens up and
i receive this message
"extension RANDR missing on display 1.0 "
then it closes the terminal

anyone know how to solve this ?

Hello @m-alarifi are you using Raspbian for Robots? Which version are you using?

Same issue for me:


Raspbian for Robots (Is that uname -a to get version or the git hash?)
pi@Carl : ~/Carl/Examples/OpenCV/PPOCV $ uname -a

Linux Carl 4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv7l GNU/Linux

pushd ~/di_update/Raspbian_For_Robots/

git rev-parse HEAD


GoPiGo3 Firmware
pip freeze | grep gopigo3

gopigo3 ==1.2.0

DI Sensors
pip freeze | grep DI-Sensors

DI-Sensors ==1.0.0

Python Installed
dpkg -s python python3 | grep Version

Version : 2.7.13-2
Version : 3.5.3-1

pip freeze | grep opencv
opencv -contrib-python==

vnc remote desktop from MacOS to GoPiGo3/R4R desktop using: vnc://x.x.x.x:5901
terminal on desktop executing python3 script

   cv2.imshow("Input image", image)

Warning seen:
Xlib: extension “RANDR” missing on display “:1.0”.

Is this because Raspbian For Robots uses tightvnc, (which Internet search suggests does not support resizing windows)?

I wouldn’t mind a bigger window, but it isn’t a show stopper for me.

Yeah, pretty much. It’s because Raspian For Robots uses tightvnc.

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