Hello @jandrusk, this game has a native linux version and the logs indicate you're using it without Proton involved, so your issue is unrelated to Proton.
~That set aside, you may have some luck with the workarounds suggested at https://steamcommunity.com/app/257510/discussions/0/541906348056987270/#c541906989389482231.~
Closing as out-of-scope.
On second thought, Talos Principle dropped support for OpenGL (available in a legacy branch) a while back, and it looks like you've not encountered a suggestion similar to https://github.com/ValveSoftware/Proton/wiki/For-AMD-users-having-issues-with-non-OpenGL-games to get Vulkan working on your SI-generation video card.
I've noticed two issues with The Talos Principle running on Proton 9.0-4, 10.0-3 (RC) and Experimental (2025-10-24)
Specs:
The game no longer works properly with Proton 11.0-1. After the intro logos, you need to mouse click to display a "login credentials form" that doesn't work and you can't pass by. This form is not displayed with Proton 10.
Proton logs: steam-257510.tar.gz
Specs:
proton 11.0-1x1 2026-07proton 9.0-4x1 2025-11
Compatibility Report
System Information
GPU: ATI Cape Verde PRO / Venus LE / Tropo PRO-L [Radeon HD 8830M / R7 250 / R7 M465X]
Driver/LLVM version: Radeon
Kernel version: 5.0.0-20-generic
Link to full system information report as Gist: https://gist.github.com/jandrusk/8b221c0e6baf2e06be2f59e02eb7b3fb
Proton version:
I confirm:
Symptoms
When attempting to run The Talos Principle on Ubuntu 19.04 AMD64, I keep getting the error, "Unable to set display". I've tried updating the graphics driver via an PPA for the Radeon driver and some other suggestions from Google search results, but nothing seems to resolve the issue.
Reproduction