This sounds connected to a bug with Gnome which I reported a while back. Your main screen is prob the one with mythtv running on, and your prob working on the 2nd screen. The problem is the xscreensaver and standby stuff seems to only work with the first screen. Try swapping them around, or turning of standby and get in the havit of turning them off yourself for a quick hack of a fix.
http://bugzilla.gnome.org/show_bug.cgi?id=437300 -- Monitors go into stand-by when only using one monitor https://bugs.launchpad.net/bugs/128825 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
