fbdir option to Xvfb object:
vdisplay = Xvfb(width=1920, height=1080, colordepth=24, fbdir="/tmp/")
This option will tell xfvb to save dumps of its contents to
The dump file will be in
.xwd format, so it needs to be converted to some format supported by image viewers.
For the convenience you can use the following script: