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Diffstat (limited to 'nixpkgs/nixos/doc/manual/configuration/x-windows.xml')
| -rw-r--r-- | nixpkgs/nixos/doc/manual/configuration/x-windows.xml | 134 |
1 files changed, 133 insertions, 1 deletions
diff --git a/nixpkgs/nixos/doc/manual/configuration/x-windows.xml b/nixpkgs/nixos/doc/manual/configuration/x-windows.xml index 798d1fbdfd85..7cdc5196e0d2 100644 --- a/nixpkgs/nixos/doc/manual/configuration/x-windows.xml +++ b/nixpkgs/nixos/doc/manual/configuration/x-windows.xml @@ -125,10 +125,12 @@ You will need to reboot after enabling this driver to prevent a clash with other kernel modules. </para> + <note> <para> - Note: for recent AMD GPUs you most likely want to keep either the defaults + For recent AMD GPUs you most likely want to keep either the defaults or <literal>"amdgpu"</literal> (both free). </para> + </note> </simplesect> <simplesect xml:id="sec-x11-touchpads"> <title>Touchpads</title> @@ -157,4 +159,134 @@ versions. </para> </simplesect> + <simplesect xml:id="custom-xkb-layouts"> + <title>Custom XKB layouts</title> + <para> + It is possible to install custom + <link xlink:href="https://en.wikipedia.org/wiki/X_keyboard_extension"> + XKB + </link> + keyboard layouts using the option + <option> + <link linkend="opt-services.xserver.extraLayouts"> + services.xserver.extraLayouts + </link> + </option>. + 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. + </para> + <para> + To do this we are going to create a <literal>us-greek</literal> file + with a <literal>xkb_symbols</literal> section. + </para> +<programlisting> +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 ] }; +}; +</programlisting> + <para> + To install the layout, the filepath, a description and the list of + languages must be given: + </para> +<programlisting> +<xref linkend="opt-services.xserver.extraLayouts"/>.us-greek = { + description = "US layout with alt-gr greek"; + languages = [ "eng" ]; + symbolsFile = /path/to/us-greek; +} +</programlisting> + <note> + <para> + The name should match the one given to the + <literal>xkb_symbols</literal> block. + </para> + </note> + <para> + The layout should now be installed and ready to use: try it by + running <literal>setxkbmap us-greek</literal> and type + <literal><alt>+a</literal>. To change the default the usual + <option> + <link linkend="opt-services.xserver.layout"> + services.xserver.layout + </link> + </option> + option can still be used. + </para> + <para> + A layout can have several other components besides + <literal>xkb_symbols</literal>, for example we will define new + keycodes for some multimedia key and bind these to some symbol. + </para> + <para> + Use the <emphasis>xev</emphasis> utility from + <literal>pkgs.xorg.xev</literal> to find the codes of the keys of + interest, then create a <literal>media-key</literal> file to hold + the keycodes definitions + </para> +<programlisting> +xkb_keycodes "media" +{ + <volUp> = 123; + <volDown> = 456; +} +</programlisting> + <para> + Now use the newly define keycodes in <literal>media-sym</literal>: + </para> +<programlisting> +xkb_symbols "media" +{ + key.type = "ONE_LEVEL"; + key <volUp> { [ XF86AudioLowerVolume ] }; + key <volDown> { [ XF86AudioRaiseVolume ] }; +} +</programlisting> + <para> + As before, to install the layout do + </para> +<programlisting> +<xref linkend="opt-services.xserver.extraLayouts"/>.media = { + description = "Multimedia keys remapping"; + languages = [ "eng" ]; + symbolsFile = /path/to/media-key; + keycodesFile = /path/to/media-sym; +}; +</programlisting> + <note> + <para> + The function <literal>pkgs.writeText <filename> <content> + </literal> can be useful if you prefer to keep the layout definitions + inside the NixOS configuration. + </para> + </note> + <para> + Unfortunately, the Xorg server does not (currently) support setting a + keymap directly but relies instead on XKB rules to select the matching + components (keycodes, types, ...) of a layout. This means that components + other than symbols won't be loaded by default. As a workaround, you + can set the keymap using <literal>setxkbmap</literal> at the start of the + session with: + </para> +<programlisting> +<xref linkend="opt-services.xserver.displayManager.sessionCommands"/> = "setxkbmap -keycodes media"; +</programlisting> + <para> + To learn how to write layouts take a look at the XKB + <link xlink:href="https://www.x.org/releases/current/doc/xorg-docs/input/XKB-Enhancing.html#Defining_New_Layouts"> + documentation + </link>. More example layouts can also be found + <link xlink:href="https://wiki.archlinux.org/index.php/X_KeyBoard_extension#Basic_examples"> + here + </link>. + </para> +</simplesect> </chapter> |