Defense Grid directx11 issue

[pdanoe]

Compatibility Report

• Name of the game with compatibility issues: Defense Grid
• Steam AppID of the game: 18500

System Information

• GPU: Corei7 onboard video
• Driver/LLVM version:
• Kernel version: xubuntu 18.04
• Link to full system information report as Gist:
• Proton version: 3:7-8 3:16-9 4:2-9 4:11-13 5:0-10 5:13-6 6:3-8

I confirm:

• [ x] that I haven't found an existing compatibility report for this game.
• [ x] that I have checked whether there are updates for my system available.

Not sure what is asked for here. The problem has remained even when I downgraded the xubuntu from 20 to 18. So much I can say.

Symptoms

For about the last 2 years, I have been unable to make proton install directx11 when initialising the game after install. Until 2 years ago, I was able to make proton install directx11 by downloading the game, changing to a higer proton version, run the game (for which the proton version was too high, but it managed to discover that it should install directx11), change to lower proton version e.g. 3:7-8. run the game again, and there it would install the needed directx11.
When there is no directx11, the game will simply show a white screen.
Hope this is information enough for now.
Defense grid is an older game by now, but would be nice to see it work again

Reproduction

[kisak-valve]

Hello @pdanoe, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to #669 (comment).