Out of Range Signal (60 Hz)

[Thomas]

Try to set to a lower resolution, you can do this by editing the settings.cfg file directlry (it is .frictionalgames/Penumbra Overture/Episode1/) and change width and height to something else like 800x600.

You can also try and find some refreshrate locking tool. Not sure if there is one for linux though, perhaps someone else can help.