VDPAU_DRIVER broken for NVIDIA + Intel CPU

[bbigras]

since 1da3ba1, Chrome doesn't start anymore. See NixOS/nixpkgs#162499

Should common/gpu/nvidia.nix just set VDPAU_DRIVER to nvidia?

@ilkecan

[ilkecan]

Assuming setting an environment variable like VDPAU_DRIVER is within the scope of this project, I think what you propose is the correct solution. Since nvidia is the default value, it should have priority over the mkDefault in the intel module, so something like mkOverride 900 "nvidia" could be used.

Also it might be a good idea to split the graphics related parts of common/cpu/intel.nix into a new file named common/gpu/intel.nix.

[06kellyjac]

Just for my sake, where is VDPAU_DRIVER's default set to nvidia?

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As for your comment both changes sounds good

[ilkecan]

VDPAU_DRIVER is not set by default. In my experience the driver used defaults to nvidia when the environment variable is not set. I found this reasonable considering VDPAU was created by NVIDIA, so I didn't look into it further.