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<chapter xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="sec-x11">
<title>X Window System</title>
<para>The X Window System (X11) provides the basis of NixOS graphical
user interface. It can be enabled as follows:
<programlisting>
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<xref linkend="opt-services.xserver.enable"/> = true;
</programlisting>
The X server will automatically detect and use the appropriate video
driver from a set of X.org drivers (such as <literal>vesa</literal>
and <literal>intel</literal>). You can also specify a driver
manually, e.g.
<programlisting>
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<xref linkend="opt-services.xserver.videoDrivers"/> = [ "r128" ];
</programlisting>
to enable X.orgs <literal>xf86-video-r128</literal> driver.</para>
<para>You also need to enable at least one desktop or window manager.
Otherwise, you can only log into a plain undecorated
<command>xterm</command> window. Thus you should pick one or more of
the following lines:
<programlisting>
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<xref linkend="opt-services.xserver.desktopManager.plasma5.enable"/> = true;
<xref linkend="opt-services.xserver.desktopManager.xfce.enable"/> = true;
<xref linkend="opt-services.xserver.desktopManager.gnome3.enable"/> = true;
<xref linkend="opt-services.xserver.windowManager.xmonad.enable"/> = true;
<xref linkend="opt-services.xserver.windowManager.twm.enable"/> = true;
<xref linkend="opt-services.xserver.windowManager.icewm.enable"/> = true;
<xref linkend="opt-services.xserver.windowManager.i3.enable"/> = true;
</programlisting>
</para>
<para>NixOSs default <emphasis>display manager</emphasis> (the
program that provides a graphical login prompt and manages the X
server) is SLiM. You can select an alternative one by picking one
of the following lines:
<programlisting>
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<xref linkend="opt-services.xserver.displayManager.sddm.enable"/> = true;
<xref linkend="opt-services.xserver.displayManager.lightdm.enable"/> = true;
</programlisting>
</para>
<para>You can set the keyboard layout (and optionally the layout variant):
<programlisting>
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<xref linkend="opt-services.xserver.layout"/> = "de";
<xref linkend="opt-services.xserver.xkbVariant"/> = "neo";
</programlisting>
</para>
<para>The X server is started automatically at boot time. If you
dont want this to happen, you can set:
<programlisting>
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<xref linkend="opt-services.xserver.autorun"/> = false;
</programlisting>
The X server can then be started manually:
<screen>
# systemctl start display-manager.service
</screen>
</para>
<simplesect><title>NVIDIA Graphics Cards</title>
<para>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 its not free software. You can enable it as follows:
<programlisting>
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<xref linkend="opt-services.xserver.videoDrivers"/> = [ "nvidia" ];
</programlisting>
Or if you have an older card, you may have to use one of the legacy drivers:
<programlisting>
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<xref linkend="opt-services.xserver.videoDrivers"/> = [ "nvidiaLegacy340" ];
<xref linkend="opt-services.xserver.videoDrivers"/> = [ "nvidiaLegacy304" ];
<xref linkend="opt-services.xserver.videoDrivers"/> = [ "nvidiaLegacy173" ];
</programlisting>
You may need to reboot after enabling this driver to prevent a clash
with other kernel modules.</para>
<para>On 64-bit systems, if you want full acceleration for 32-bit
programs such as Wine, you should also set the following:
<programlisting>
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<xref linkend="opt-hardware.opengl.driSupport32Bit"/> = true;
</programlisting>
</para>
</simplesect>
<simplesect><title>AMD Graphics Cards</title>
<para>AMD 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 its not free software. You can enable it as follows:
<programlisting>
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<xref linkend="opt-services.xserver.videoDrivers"/> = [ "ati_unfree" ];
</programlisting>
You will need to reboot after enabling this driver to prevent a clash
with other kernel modules.</para>
<para>On 64-bit systems, if you want full acceleration for 32-bit
programs such as Wine, you should also set the following:
<programlisting>
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<xref linkend="opt-hardware.opengl.driSupport32Bit"/> = true;
</programlisting>
</para>
</simplesect>
<simplesect><title>Touchpads</title>
<para>Support for Synaptics touchpads (found in many laptops such as
the Dell Latitude series) can be enabled as follows:
<programlisting>
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<xref linkend="opt-services.xserver.libinput.enable"/> = true;
</programlisting>
The driver has many options (see <xref linkend="ch-options"/>). For
instance, the following disables tap-to-click behavior:
<programlisting>
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<xref linkend="opt-services.xserver.libinput.tapping"/> = false;
</programlisting>
Note: the use of <literal>services.xserver.synaptics</literal> is deprecated since NixOS 17.09.
</para>
</simplesect>
<simplesect><title>GTK/Qt themes</title>
<para>GTK themes can be installed either to user profile or system-wide (via
<literal>environment.systemPackages</literal>). To make Qt 5 applications look similar
to GTK2 ones, you can install <literal>qt5.qtbase.gtk</literal> package into your
system environment. It should work for all Qt 5 library versions.
</para>
</simplesect>
</chapter>