Keyboard doesn't work in Slim login manager

[mythmon]

Issue description

Keyboard does not work in Slim using commit 82bcfef or after. I determined that commit using git bisect. The one right before it works fine.

Steps to reproduce

Using the below configuration.nix and 82bcfef, run nixos-rebuild build-vm and run the VM. When the VM gets to a log in screen, typing in the login box doesn't work. On my laptop I also can't switch to another VT using ctrl+alt+F2. I'm not sure how to do that in the VM.

configuration.nix

{
  services.xserver = {
    enable = true;
    displayManager.slim.enable = true;
  };
}

Technical details

• System: (NixOS: nixos-version, Ubuntu/Fedora: lsb_release -a, ...)

  $ nixos-version
  17.03.git.58dcda6 (Gorilla)
  

• Nix version: (run nix-env --version)

  $ nix-env --version
  nix-env (Nix) 1.11.6
  

• Nixpkgs version:

  $ nix-instantiate --eval '<nixpkgs>' -A lib.nixpkgsVersion
  "17.03pre99759.f66d782"
  

[vcunat]

Could this be an instance of #22290? That should be verifiable by trying with that particular commit reverted.

[fpletz]

We could reproduce this with slim. It is in fact due to 82bcfef.

[fpletz]

Reverted for now in 24f3abd.