Comment 16 for bug 883618

Another reason why should the X11 messing thrown out:
Someone might have set his X11 to blank, say, in 20 seconds (ie on open cellphone, not sure if GTA04 runs ubuntu, but it definitely could).
do-release-upgrade would then turn the screen off and on repeatedly.
Which is even worse with OLED displays, needlessly shortening their lives and wasting energy

So if polling is the best you can do, please don't do anything at all.