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...
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
Alexander Ross has covered the video game industry for a decade, writing deep dives on game design, esports tournaments, VR developments, and gaming culture.
