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Launch options

You can configure startup options with right-click on the game title and then select "Properties...". The launch options are then in the "General" section.

Also see https://help.steampowered.com/en/faqs/view/7d01-d2dd-d75e-2955.

The following launch options are supported for Valve titles (Half Life, Portal etc.) but may also be used by other games:

  • -autoconfig - restores video and performance settings to default for the current hardware detected. Ignores settings inside any .cfg files until this parameter is removed.
  • -novid or novideo - don't show opening video
  • -w <pixels> - width in pixels (e.g. -w 1920)
  • -h <pixels> - height in pixels (e.g. -h 1080)
  • -fullscreen - force start in fullscreen mode
  • -windowed or -sw - force start in windowed mode

Fixing startup problems for Portal with RTX

Portal with RTX tends to crash if you use a higher resolution than 1920x1080. Therefore using -w 1920 -h 1080 as launch options may help if you have a screen with 2560x1440 or 3840x2160.

Also using -autoconfig can help, if you changed any of the advanced video settings and the game won't start any longer without crashing. For example enabling 4xMSAA seems not to work well in combination with RTX on some cards.