how to add the missing RANDR extension

Question

I have setup the xvfb server on my headless server and when I m running the DISPLAY  99 firefox  I am getting this exception missing RANDR extension  Many of them said to disable some xinerna from the xorg conf file but this file is not getting created in my case   So I am searching for how to add the missing RANDR extension

User · Accepted Answer

First off  Xvfb doesn t read configuration from xorg conf  Xvfb is a variant of the KDrive X servers and like all members of that family gets its configuration from the command line   It is true that XRandR and Xinerama are mutually exclusive  but in the case of Xvfb there s no Xinerama in the first place  You can enable the XRandR extension by starting Xvfb using at least the following command line options  Xvfb  extension RANDR  further options

User · Answer

I had the same problem with Firefox 30   Selenium 2 49   Ubuntu 15 04   It worked fine with Ubuntu 14 but after upgrade to 15 04 I got same RANDR warning and problem at starting Firefox using Xfvb   After adding  extension RANDR it worked again     vim  etc init xvfb conf    upstart description  Xvfb Server as a daemon   start on filesystem and started networking stop on shutdown  respawn  env XVFB  usr bin Xvfb env XVFBARGS   10 -screen 1 1024x768x24 -ac  extension GLX  extension RANDR  render -noreset  env PIDFILE  var run xvfb pid  exec start-stop-daemon --start --quiet --make-pidfile --pidfile  PIDFILE --exec  XVFB --  XVFBARGS  gt  gt   var log xvfb log 2 gt  amp 1

User · Answer

I am seeing this error message when I run Firefox headless through selenium using xvfb   It turns out that the message was a red herring for me   The message is only a warning  not an error  It is not why Firefox was not starting correctly   The reason that Firefox was not starting for me was that it had been updated to a version that was no longer compatible with the Selenium drivers that I was using   I upgraded the selenium drivers to the latest and Firefox starts up fine again  even with this warning message about RANDR    New releases of Firefox are often only compatible with one or two versions of Selenium   Occasionally Firefox is released with NO compatible version of Selenium     When that happens  it may take a week or two for a new version of Selenium to get released      Because of this  I now keep a version of Firefox that is known to work with the version of Selenium that I have installed   In addition to the version of Firefox that is kept up to date by my package manager  I have a version installed in  opt   eg  opt firefox31     The Selenium Java API takes an argument for the location of the Firefox binary to be used   The downside is that older versions of Firefox have known security vulnerabilities and shouldn t be used with untrusted content

[x11] how to add the missing RANDR extension

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