Rocket League (252950)

Compatibility Report

• Name of the game with compatibility issues: Rocket League
• Steam AppID of the game: 252950

System Information

• GPU: GTX 970
• Driver/LLVM version: nvidia 440.59
• Kernel version: 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
• Link to full system information report as Gist:
  https://gist.github.com/Oliver-1xok/1faf131563237060edc339a413646150
• Proton version: 5.0-1

LOGS

Here are the Proton logs from my system:
steam-252950.log

Here is an output of the PS command for the corresponding processes which are created in the system:
ps.log

Symptoms

When I start the experimental DX11 client from Rocket League the game does not work.

You can start this client with the launch option "-dx11". A window appears with the title: "Rocket League (64-bit, DX11, Cooked)".

The window does not disappear and is not updated after a while. No window with the game appears.
The 32-bit DX9 client of the game runs on my system without major problems and the game starts after a short time. The experimental DX11 client no longer does this.

Reproduction

1. Follow these steps:
   https://steamcommunity.com/app/252950/discussions/0/1738889518180525789/
2. For additional Proton Log use the following launch options: "PROTON_LOG=1 %command% -dx11"
3. Click on Start

Start by reproducing the launch sequence with Proton 5.0-1 and PROTON_LOG=1 %command% -dx11, following the linked Steam Community steps. Review steam-252950.log, ps.log, and the linked system report; done would mean identifying and resolving the DX11 startup hang while preserving the working DX9 client.