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I'm facing RANDR missing problem with Xvfb and firefox.

Some people suggested Xvfb :1 -extension RANDR can solve the problem. But I found a also +extension option.

In my environment(CentOS6.5), the both fails.

But I want to know at least if there is difference between -extension and +extension. I couldn't find entry about it in man Xvfb.

Do someone know about it?

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See Xserver(1):

  -extension extensionName
       disables named extension. If an unknown extension name is specified, a list of accepted extension names is printed.

  +extension extensionName
       enables named extension. If an unknown extension name is specified, a list of accepted extension names is printed.

You should be able to get list of supported extensions from glxinfo or xdpyinfo.

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