@iodream Thank you for reporting the regression! We will look into it :)
Latest Proton experimental-bleeding-edge-9.0-86937-20240321-paf6cb7-we37b544-d28c7c0-v21008d fixes the issue!
I'll leave this issue open to confirm later on when the fix reaches the stable release and to post a couple further issues with this game.
Closing as fixed with Proton 9.0-3.
Some other issues like slow game speed while panning view and flickering menus can be fixed either with gamescope or with cnc-ddraw
proton 9.0-3x1 2024-12proton experimentalx1 2024-03
Compatibility Report
System Information
I confirm:
Proton log: steam-2229840.log
Symptoms
Game crashes with "Unable to allocate primary video buffer"
This seems to be a regression because Proton 8 launches the game(albeit with other issues)
Reproduction
Start CnC Red alert