For anyone with intel hardware that want the "suspend desktop effects for fullscreen windows" there is a workaround;
There is a kwin script in kde examples that completely *disable* compositing as soon as it detects a fullscreen window.
...being compositing completely disabled, and not just the window unredirected, you'll have no flickering in fullscreen too.
i've made a zip to easy install it:
After that, you should have a new kwin script to activate; if not, try to restart kwin.
wget http://wpage.unina.it/aorefice/sharevari/nocompositingfs.zip -O /tmp/nocompositingfs.zip && plasmapkg -t kwinscript -i /tmp/nocompositingfs.zip