Xlib: extension “RANDR” missing on display “:21”.

Question

I'm trying to run some Webdriver Maven tests on a headless server via xvfb using Chrome (Firefox also didn't work) but I'm getting this error message:

Xlib:  extension "RANDR" missing on display ":21".

What more information should I provide and what could the problem/solution be?

Answer 1

jeues answer helped me nothing :-( after hours I finally found the solution for my system and I think this will help other people too. I had to set the LD_LIBRARY_PATH like this:

   export LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/

after that everything worked very well, even without any "-extension RANDR" switch.

Answer 2

Try this:

Xvfb :21 -screen 0 1024x768x24 +extension RANDR &

Xvfb --help

+extension name        Enable extension
-extension name        Disable extension

Answer 3

It seems that when this error appears it is an indication that the selenium-java plugin for maven is out-of-date.

Changing the version in the pom.xml should fix the problem