VidMode Support
By default, Xtheater uses the VidMode extension to try to set a
screen resolution that as closely as possilbe matches the video
being played. If small modes are unavailable, this method will be
ineffective. You can either use a scaling fullscreen or configure
some smaller resolutions, which is described here
The following modelines can be used in conjunction with the default
VidMode fullscreen behavior to provide more useful fullscreen effect for
a large number of media files. Add these lines to the monitor
section of your XF86Config file. They may not work or need
tweaking on your particular platform:
<![CDATA[
Modeline "512x384" 22.00 512 528 592 640 384 385 388 404 -hsync -vsync
Modeline "400x300" 20.00 400 424 488 520 300 319 322 333 doublescan
Modeline "352x240" 14.75 352 368 416 432 240 244 246 262 doublescan
Modeline "320x240" 12.75 320 336 384 400 240 244 246 262 doublescan
Modeline "320x200" 11.50 320 336 384 400 200 204 205 225 doublescan
]]>
After adding these, make sure you list the modes in the Modes
section of your Display subsection of the Screen section. VidMode
fullscreen should then work much better.