Unable to Initialize Display

[jens]

In your case, as the game has launched successfully you have to edit the settings.cfg file located in home directory/.frictionalgames/PenumbraOverture/. The deafult_settings.cfg file is only used on first launch and should only be edited if experiencing a problem with launching the game at all.

You could most likely use crtl-alt-F1 to bring up a terminal window, then run top, press k, enter the PID of the penumbra process, kill with 9 and then go back to the desktop with ctrl-alt-F7?