Stupid ubuntu screensaver config
The default gnome configuration tool in ubuntu (Intrepid, Jaunty, ...) for the screensaver is largely incomplete. Install the
xscreensaver package and configure it the "old" way (with
xscreensaver-demo). However, this will NOT be enough, because gnome overrides part of its settings when it starts its own screen saver. So you will have to look at
~/.xscreensaverrc and update the config for your favorite screen saver in
/usr/share/applications/screensavers/<your_screensaver_here>.desktop. For example, for me, the
Exec line for glslideshow in the desktop file looks like:
Exec=glslideshow -root -duration 25 -pan 30 -fade 4
And the picture configuration is taken from my
~/.xscreensaverrc file.