modified: README.md

new file:   docs/journald.md

README.md

@@ -16,6 +16,7 @@
   - [Network Configuration](#network-configuration)
     - [hostname / hostnamectl](#hostname--hostnamectl)
     - [static ip](#static-ip)
+  - [System info](#system-info)
   - [System Monitoring Utilities](#system-monitoring-utilities)
     - [btop](#btop)
     - [memory usage by user](#memory-usage-by-user)
@@ -216,6 +217,16 @@ Reiniciar configuração sem reboot de computador
 sudo /etc/init.d/networking restart
 ```
 
+### System info
+
+```bash
+# get distribution
+cat /etc/os-release
+
+# get kernel version
+uname -a
+```
+
 ### System Monitoring Utilities
 
 #### btop

docs/display-managers/matchbox‑wm.md

@@ -79,3 +79,23 @@ Stop auto tty session and kill sessions:
 ``` bash
 sudo systemctl stop getty@tty1
 ```
+
+if stuck in a kiosk loop, the system boots straight into:
+
+* matchbox-window-manager
+* Chromium kiosk
+and cannot switch TTY, cannot access a terminal, and cannot fix the script.
+
+Interrupt GRUB and boot into console mode.
+
+**Steps:**
+
+1. Reboot the machine
+1. When it starts, force the GRUB menu to appear:
+1. When GRUB appears, highlight your Linux entry
+1. Press e to edit
+1. Find the line starting with:
+  ```linux /boot/vmlinuz...```
+
+1. At the end of that line, add:
+```systemd.unit=multi-user.target```

docs/display-managers/sddm.md

@@ -18,3 +18,8 @@ SDDM (Simple Desktop Display Manager) is the default graphical login manager use
 
 - Replaced KDM (KDE Display Manager) starting with KDE Plasma 5.
 - Used by KDE-centric distributions like KDE neon, OpenSUSE KDE, and Fedora KDE Spin.
+
+```bash
+# control ui login at boot
+systemctl start|stop|enabled|disable sddm
+``

docs/display-protocols/wayland.md

@@ -14,3 +14,13 @@ Compositor = Display Server + Window Manager: In Wayland, the compositor handles
 - [Hyprland](../window-managers/hyprland.md), Sway, river, etc.
 
 Direct rendering: Applications render their own graphics and hand them off to the compositor, reducing complexity and improving performance.
+
+## misc
+
+**Restart Kwn compositor (does not kill your session).**
+
+Used for wake up from gpu/monitor from sleep remotely, works over ssh
+
+``` bash
+kwin_wayland --replace &
+```

docs/journald.md

@@ -0,0 +1,7 @@
+# journald
+
+**get errors from last boot:**
+
+```bash
+journalctl -b -1 -p err
+```