Change:
The Talos Principle fails to launch when configured to use its Vulkan renderer: The Talos Principle from steam. steam from a terminal. it and in GRAPHICS OPTIONS set RENDERER to VULKAN (BETA) game restarts and pops up a messagebox saying "Fatal error: Cannot set display mode". The terminal shows further information, including the message about being unable to find an ICD. System: NixOS 17.09pre102667. (Hummingbird) Nix version: nix-env (Nix) 1.11.7 Nixpkgs version: 17.09pre102667. services.xserver.videoDrivers = [ "nvidia" ]; vulkan-loader is installed system-wide
/cc for steam. I suspect some links are missing in the sandbox.
Can you try
With that it works.
Thanks for testing!
A very nice game, IMHO!
I'll put it further up in the list to try :D (I don't think my integrated nvidia will cut it though)
It's quite scalable performance-wise, might well be worth a try if you own it.
It was fine on my old notebook, even without vulkan. (GT 420M) I suppose it depends on your desired quality settings :-)
Actually I hope Vulkan will improve the situation. I'm not picky with my graphics :D
I don't remember if it's supposed to affect old GPUs in any way.

Discussion:
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<ins> {stdenv, fetchurl, yacc, flex, pkgconfig, glib, xz}: stdenv.mkDerivation rec { version = "0.16.1"; name = "vala-${version}"; src = fetchurl { url = "mirror://gnome/sources/vala/0.16/${name}.tar.xz"; sha256 = "1n708n9ixyy9qrzyv1wf4ybvcclx43ib9ki028wwpvkz6kv8zqlb"; }; buildNativeInputs = [ yacc flex pkgconfig xz ]; buildInputs = [ glib ]; meta = { description = "Compiler for the GObject type system"; homepage = "http://live.gnome.org/Vala"; license = "free-copyleft"; platforms = stdenv.lib.platforms.all; maintainers = [ stdenv.lib.maintainers.antono ]; }; } </ins>

{stdenv, fetchurl, yacc, flex, pkgconfig, glib, xz}: stdenv.mkDerivation rec { <del> name = "vala-0.14.2"; </del> <ins> version = "0.17.2"; name = "vala-${version}"; </ins> src = fetchurl { <del> url = mirror://gnome/sources/vala/0.14/vala-0.14.2.tar.xz; sha256 = "1l5kllw9vpwv24lzv9fp64l3sad46wpxgvsgryrwlrjg91w6jzl0"; </del> <ins> url = "mirror://gnome/sources/vala/0.17/${name}.tar.xz"; sha256 = "09i2s0dwmrk147ind2dx7nq845g12fp6fsjqrphhrr0dbi0zzgh3"; </ins> }; buildNativeInputs = [ yacc flex pkgconfig xz ];

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urweb = callPackage ../development/compilers/urweb { }; <del> vala = callPackage ../development/compilers/vala { }; </del> <ins> vala = vala17; vala15 = callPackage ../development/compilers/vala/15.2.nix { }; vala16 = callPackage ../development/compilers/vala/16.1.nix { }; vala17 = callPackage ../development/compilers/vala/default.nix { }; </ins> visualcpp = callPackage ../development/compilers/visual-c++ { };