When launching on a display at a resolution other than the current display's resolution, CS2 refuses to actually go fullscreen. Adding the launch option does not help.

Here, the native resolution of 3440x1440@99Hz is the desktop resolution. Launching CS2 fullscreen should work but it doesn't when the game resolution is set to 2560x1080.

Now, a manual workaround of setting the in game setting to "Windowed" and back to "Fullscreen" does work... but this is extremely annoying to do everytime you launch...

So what happens when it is working? Well CS2 actually changes the display's resolution. Fortunately, we can do this with our Launch Options!

For Xorg sessions, the display resolution can be adjusted using the xrandr[manpages.debian.org] package.

first from a terminal, run to view which monitors are connected and available resolutions.


from here we can build our Launch Options:


What this does is specify the target resolution for the display, then launch CS2 with the same resolution in fullscreen, and then when the game is quit, it returns the display to the native resolution


For wayland displays, xrandr won't work. But there is an equivalent wlr-randr[manpages.debian.org] that works for SOME compositors.

wl-randr will NOT work for KDE or GNOME running their default wayland compositors as they are not based on wlroots

For wayland compositors based on wlroots, try the following:

For GNOME, you might try gnome-monitor-config[github.com] to achieve the same result:

Hopefully this solution helps until Valve can get around to fixing the bug!

The basic ideas from above can be adapted as necessary to suit your needs.