I managed to "solve" it somehow. As I found out later, it was necessary to change System -> Preferences -> Power Managment -> Put display to sleep... (and move the slider to the "never" position).
It'd be good to have it in one place someday. I've also disabled screensaver (I don't like screensavers, especially cpu-hungry opengl-ones ;)) but i don't know if it's necessary. -- mplayer does not disable screensaver https://launchpad.net/bugs/45760 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
