High CPU usage when the screen is off

[Google Code Exporter]

I know the tool is probably abandoned (although it still works almost 
perfectly), but maybe someone will notice and fix this: when the screen is off 
on my Ubuntu computer the GDX Texture Packer takes 100% of the CPU causing my 
laptop to overheat a little.

Original issue reported on code.google.com by [e-mail] on 5 Sep 2014 at 1:09