If you experience screen tearing no matter what, this configuration was
reported to resolve the issue:

```nix
{
  services.xserver.videoDrivers = [ "intel" ];
    services.xserver.deviceSection = ''
    Option "DRI" "2"
    Option "TearFree" "true"
  '';
}
```

Note that this will likely downgrade the performance compared to
`modesetting` or `intel` with DRI 3 (default).

## Proprietary NVIDIA drivers {#sec-x11-graphics-cards-nvidia}

NVIDIA provides a proprietary driver for its graphics cards that has
better 3D performance than the X.org drivers. It is not enabled by
default because it's not free software. You can enable it as follows:

```nix
{
  services.xserver.videoDrivers = [ "nvidia" ];
}
```

If you have an older card, you may have to use one of the legacy drivers:

```nix
{
  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.legacy_470;
  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.legacy_390;
  hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.legacy_340;
}
```

You may need to reboot after enabling this driver to prevent a clash
with other kernel modules.

## Touchpads {#sec-x11-touchpads}

Support for Synaptics touchpads (found in many laptops such as the Dell
Latitude series) can be enabled as follows:

```nix
{
  services.libinput.enable = true;
}
```

The driver has many options (see [](#ch-options)).
For instance, the following disables tap-to-click behavior:

```nix
{
  services.libinput.touchpad.tapping = false;
}
```

Note: the use of `services.xserver.synaptics` is deprecated since NixOS
17.09.

## GTK/Qt themes {#sec-x11-gtk-and-qt-themes}

GTK themes can be installed either to user profile or system-wide (via
`environment.systemPackages`). To make Qt 5 applications look similar to
GTK ones, you can use the following configuration:

```nix
{
  qt.enable = true;
  qt.platformTheme = "gtk2";
  qt.style = "gtk2";
}
```

## Custom XKB layouts {#custom-xkb-layouts}

It is possible to install custom [ XKB
](https://en.wikipedia.org/wiki/X_keyboard_extension) keyboard layouts
using the option `services.xserver.xkb.extraLayouts`.

As a first example, we are going to create a layout based on the basic
US layout, with an additional layer to type some greek symbols by
pressing the right-alt key.

Create a file called `us-greek` with the following content (under a
directory called `symbols`; it's an XKB peculiarity that will help with
testing):

```
xkb_symbols "us-greek"
{
  include "us(basic)"            // includes the base US keys
  include "level3(ralt_switch)"  // configures right alt as a third level switch

  key <LatA> { [ a, A, Greek_alpha ] };
  key <LatB> { [ b, B, Greek_beta  ] };
  key <LatG> { [ g, G, Greek_gamma ] };
  key <LatD> { [ d, D, Greek_delta ] };
  key <LatZ> { [ z, Z, Greek_zeta  ] };
};
```

A minimal layout specification must include the following:

```nix
{
  services.xserver.xkb.extraLayouts.us-greek = {
    description = "US layout with alt-gr greek";