Resizing an Xvfb display

Question

Simple Question: Is there a way to resize a Xvfb display?

I tried with RandR but it seems that the RandR extension is not supported by Xvfb. Are there other ways to resize the screen?

Thanks for your help!

Answer 1

You can use the server-args command line argument to specify a custom resolution for the virtual frame buffer being created, but this does not change the resolution of an existing virtual frame buffer:

xvfb-run --server-args="-screen 0, 1024x768x24" ...

Answer 2

Most distributions now ship a version of Xvfb with randr support. The code was committed in late 2015 vfb: add randr support (v2).

To resize you will first need to define a new mode (you can use tools like gtf to get the modeline definition values), add it to the virtual output, and then you can switch to it.

ie for 1280x1024:

xrandr --newmode "1280x1024"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync
xrandr --addmode screen 1280x1024
xrandr -s 1280x1024