NVidia Prime Render sync doesn't work with vdpau

[mdedetrich]

Describe the bug If you are using nvidia prime render sync it doesn't appear to work with vdpau (required for GPU accelerated video playback).

To Reproduce Steps to reproduce the behavior:

1. Enable nvidia prime render sync using hardware.nvidia.prime.sync.enable = true (plus other steps) and install vdpauinfo
2. Add vaapiIntel, vaapiVdpau, libvdpau-va-gl, intel-media-driver to hardware.opengl.extraPackages.
3. Run vdpauinfo either directly

Expected behavior vpdauinfo works correctly. Instead it prints

display: :0   screen: 0
Xlib:  extension "GLX" missing on display ":0".
libvdpau-va-gl: GLXGlobalContext::GLXGlobalContext: glXChooseVisual failed
Xlib:  extension "GLX" missing on display ":0".
Error creating VDPAU device: 23

Additional context Relevant settings

  hardware.nvidia = {
    modesetting.enable = true;
    prime = {
      sync.enable = true;  
      nvidiaBusId = "PCI:1:0.0";
      intelBusId = "PCI:0:2.0";
    };
  };  

  hardware.opengl = {
    enable = true;
    driSupport32Bit = true;
    extraPackages = with pkgs; [
      vaapiIntel
      vaapiVdpau
      libvdpau-va-gl
      intel-media-driver
    ];
  };

  services.xserver.videoDrivers = [ "intel" "nvidiaBeta" ];

Metadata Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

 - system: `"x86_64-linux"`
 - host os: `Linux 5.5.13, NixOS, 20.09pre218613.ae6bdcc5358 (Nightingale)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.3`
 - channels(root): `"nixos-20.09pre218613.ae6bdcc5358"`
 - channels(mdedetrich): `"nixpkgs-20.09pre218717.05f0934825c"`
 - nixpkgs: `/home/mdedetrich/.nix-defexpr/channels/nixpkgs`

Maintainer information:

attribute: hardware.nvidia, hardware.opengl

[eadwu]

sync != offload, although vdpauinfo should be working in Prime SYNC as well.

[mdedetrich]

@eadwu Thanks, I have updated the issue

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