Extension “RANDR” missing on xvfb

Ubuntu:

$lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty

Xvfb:

$ dpkg -s xvfb
Package: xvfb
Status: install ok installed
Priority: optional
Section: x11
Installed-Size: 2140
Maintainer: Ubuntu X-SWAT <>
Architecture: amd64
Multi-Arch: foreign
Source: xorg-server
Version: 2:1.15.1-0ubuntu2.7
Provides: xserver

Current problem:

Xvfb do not support RANDR extension, even if I add the flag:

+extension RANDR

If I run xdpyinfo, RANDR is not on the list. It's a missing feature or a bug. I found a reference here with a patch:

And looks like that in other distros like debian, there is already a testing build of Xvfb with support:

I am trying to run a program throught Xvfb, and it returns the following error:

Xlib: extension "RANDR" missing on display ":99".

The program works if I run it via ssh/command line. The problem appears to be the the lack of support for "RANDR" in xvfb.

My question is: what is the easiest way to get xvfb with "RANDR" support in my system?

1 Answer

This may be a problem with the package install for 14.0.4. On 16.0.4:

$sudo apt-get install xvfb
$Xvfb :99 -screen 0 1024x768x24 > /dev/null &
$ xdpyinfo -display :99 | grep "number of extensions" -A 25
number of extensions: 25 BIG-REQUESTS Composite DAMAGE DOUBLE-BUFFER DPMS GLX Generic Event Extension MIT-SCREEN-SAVER MIT-SHM Present **** RANDR **** RECORD RENDER SECURITY SGI-GLX SHAPE SYNC X-Resource XC-MISC XFIXES XINERAMA XInputExtension XKEYBOARD XTEST XVideo