Fixes & Performance

Dual Monitor Issue in Killing Floor

Guide for solving dual monitor problems in Killing Floor.

Killing Floor Display settings menu The Killing Floor Display menu: render device, resolution and detail levels. Screenshot: PCGamingWiki.

Problem Description

When trying to maximize the game window on a system with two monitors, the following problem may occur:

  • Screens start flickering and switching
  • The game tries to use a resolution equal to the size of both monitors combined
  • The flickering process continues indefinitely
  • The game becomes unplayable

Solutions

Solution 1: Disable Extended Monitor (Simple Solution)

The simplest solution is to temporarily disable the extended monitor before launching the game:

  1. Open Windows display settings
  2. Select "Show only on 1" or "Duplicate" mode
  3. Launch the game
  4. After playing, you can restore extended mode

This solution works for most cases and does not require changing game settings.

Solution 2: Graphics Card Configuration

The problem may depend on the graphics card and installed drivers:

  1. Update graphics card drivers to the latest version
  2. Check graphics card settings:
    • NVIDIA: NVIDIA Control Panel → Set up multiple displays
    • AMD: AMD Radeon Settings → Displays
  3. Make sure all necessary driver components are installed

Solution 3: Modifying KillingFloor.ini

You can try configuring the game configuration file for proper operation with your monitor configuration:

  1. Open KillingFloor.ini in the System folder
  2. Find the [WinDrv.WindowsClient] section
  3. Set correct values for:
    • FullscreenViewportX — primary monitor width
    • FullscreenViewportY — primary monitor height
    • WindowedViewportX — windowed mode width
    • WindowedViewportY — windowed mode height
[WinDrv.WindowsClient]
FullscreenViewportX=1920
FullscreenViewportY=1080
WindowedViewportX=1920
WindowedViewportY=1080
  1. Save the file and launch the game

Solution 4: Using Windowed Mode

If the problem persists, you can use windowed mode:

  1. Launch the game
  2. In settings, select windowed mode instead of fullscreen
  3. Or use console command to switch modes

Solution 5: BIOS Configuration (for systems with two graphics cards)

If you have two different graphics cards from different manufacturers installed:

  1. Restart your computer and enter BIOS
  2. Find graphics card settings
  3. Set the additional graphics card as primary for boot
  4. Save settings and restart the computer

Additional Tips

  • Use one monitor for gaming: The simplest way to avoid problems is to play on one monitor
  • Check Windows settings: Make sure both monitors are properly configured in Windows
  • Update DirectX: Install the latest version of DirectX
  • Check compatibility: Some older games may have problems with modern monitor configurations

Sources