In my experience, DisplayMode needs to be supported. You can try the following:
DisplayMode displayMode = null;
DisplayMode[] modes = Display.getAvailableDisplayModes();
for (int i = 0; i < modes.length; i++)
{
if (modes[i].getWidth() == width
&& modes[i].getHeight() == height
&& modes[i].isFullscreenCapable())
{
displayMode = modes[i];
}
}
After that, your Display.setFullscreen (true) should work
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