add sddm

technology/applications/Applications.md

@@ -38,6 +38,7 @@ rev: 2024-12-10
 
 ## Desktop
 - [KDE Plasma](./desktops/KDE%20Plasma.md)
+- [SDDM](./desktops/SDDM.md)
 - [dwm](./desktops/dwm.md)
 - [picom](./desktops/picom.md)
 - [Hyprland](./desktops/hyprland.md)

technology/applications/desktops/SDDM.md

@@ -0,0 +1,71 @@
+---
+obj: application
+arch-wiki: https://wiki.archlinux.org/title/SDDM
+wiki: https://en.wikipedia.org/wiki/Simple_Desktop_Display_Manager
+repo: https://github.com/sddm/sddm
+rev: 2024-12-17
+---
+
+# SDDM
+The Simple Desktop Display Manager (SDDM) is a display manager. It is the recommended display manager for the KDE Plasma and LXQt desktop environments. 
+
+## Configuration
+The default configuration file for SDDM can be found at `/usr/lib/sddm/sddm.conf.d/default.conf`. For any changes, create configuration file(s) in `/etc/sddm.conf.d/`.
+
+Everything should work out of the box, since Arch Linux uses systemd and SDDM defaults to using `systemd-logind` for session management.
+
+### Autologin
+SDDM supports automatic login through its configuration file, for example (`/etc/sddm.conf.d/autologin.conf`):
+
+```ini
+[Autologin]
+User=john
+Session=plasma
+
+# Optionally always relogin the user on logout
+Relogin=true
+```
+
+This configuration causes a KDE Plasma session to be started for user `john` when the system is booted. Available session types can be found in `/usr/share/xsessions/` for X and in `/usr/share/wayland-sessions/` for Wayland.
+
+To autologin into KDE Plasma while simultaneously locking the session (e.g. to allow autostarted apps to warm up), create a systemd user unit drop in to pass `--lockscreen` in `plasma-ksmserver.service` (`~/.config/systemd/user/plasma-ksmserver.service.d/override.conf`):
+
+```ini
+[Service]
+ExecStart=
+ExecStart=/usr/bin/ksmserver --lockscreen
+```
+
+### Theme settings
+Theme settings can be changed in the `[Theme]` section. If you use Plasma's system settings, themes may show previews.
+
+Set to `breeze` for the default Plasma theme.
+
+#### Current theme
+
+Set the current theme through the Current value, e.g. `Current=archlinux-simplyblack`.
+
+#### Editing themes
+The default SDDM theme directory is `/usr/share/sddm/themes/`. You can add your custom made themes to that directory under a separate subdirectory. Note that SDDM requires these subdirectory names to be the same as the theme names. Study the files installed to modify or create your own theme.
+
+#### Customizing a theme
+To override settings in the `theme.conf` configuration file, create a custom `theme.conf.user` file in the same directory. For example, to change the theme's background (`/usr/share/sddm/themes/name/theme.conf.user`):
+
+```ini
+[General]
+background=/path/to/background.png
+```
+
+#### Testing (previewing) a theme
+You can preview an SDDM theme if needed. This is especially helpful if you are not sure how the theme would look if selected or just edited a theme and want to see how it would look without logging out. You can run something like this:
+
+```sh
+sddm-greeter-qt6 --test-mode --theme /usr/share/sddm/themes/breeze
+```
+
+This should open a new window for every monitor you have connected and show a preview of the theme.
+
+#### Mouse cursor
+To set the mouse cursor theme, set `CursorTheme` to your preferred cursor theme.
+
+Valid Plasma mouse cursor theme names are `breeze_cursors`, `Breeze_Snow` and `breeze-dark`. 

technology/linux/systemd/Systemd.md

@@ -12,6 +12,7 @@ systemd is a suite of basic building blocks for a [Linux](../Linux.md) system. I
 See also:
 - [Systemd-Timers](Systemd-Timers.md)
 - [systemd-boot](systemd-boot.md)
+- [systemd-cryptenroll](systemd-cryptenroll.md)
 
 ## Using Units
 Units commonly include, but are not limited to, services (_.service_), mount points (_.mount_), devices (_.device_) and sockets (_.socket_).

technology/linux/systemd/systemd-boot.md

@@ -1,6 +1,7 @@
 ---
 obj: application
 arch-wiki: https://wiki.archlinux.org/title/Systemd-boot
+rev: 2024-12-17
 ---
 
 # Systemd Boot
@@ -20,7 +21,8 @@ bootctl update
 ```
 
 ## Configuration
-The loader configuration is stored in the file `_esp_/loader/loader.conf`
+The loader configuration is stored in the file `_esp_/loader/loader.conf`.
+
 Example:
 ```
 default  arch.conf
@@ -30,7 +32,7 @@ editor   no
 ```
 
 ### Adding loaders
-_systemd-boot_ will search for boot menu items in `_esp_/loader/entries/*.conf`
+_systemd-boot_ will search for boot menu items in `_esp_/loader/entries/*.conf`.
 
 Values:
 - `title` : Name
@@ -57,4 +59,18 @@ systemctl reboot --boot-loader-entry=arch-custom.conf
 Firmware Setup:
 ```shell
 systemctl reboot --firmware-setup
-```
+```
+
+## Keybindings
+While the menu is shown, the following keys are active:
+
+| Key           | Description                                                                         |
+| ------------- | ----------------------------------------------------------------------------------- |
+| `Up` / `Down` | Select menu entry                                                                   |
+| `Enter`       | Boot the selected entry                                                             |
+| `d`           | select the default entry to boot (stored in a non-volatile EFI variable)            |
+| `t` / `T`     | adjust the timeout (stored in a non-volatile EFI variable)                          |
+| `e`           | edit the option line (kernel command line) for this bootup to pass to the EFI image |
+| `Q`           | quit                                                                                |
+| `v`           | show the systemd-boot and UEFI version                                              |
+| `P`           | print the current configuration to the console                                      |