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

@@ -6,8 +6,6 @@ matchbox‑wm is a minimal, single‑window X11 window manager originally design
 
 * Single‑window design: Only one application window is shown at a time, always fullscreen.
 
-* Extremely lightweight: Uses roughly 1–2 MB of RAM, suitable for low‑memory environments.
-
 * No desktop components: No panels, menus, compositors, notifications, or session daemons.
 
 * Deterministic behavior: Eliminates window management complexity, ideal for locked‑down kiosk workflows.
@@ -23,9 +21,11 @@ apt update
 apt install matchbox-window-manager xorg 
 ```
 
-## Setup user
+## Setup
 
-Example to start matchbox-window-manager with chromium on user xxx login.
+Example to start matchbox-window-manager, auto login user xxx and start chromium kiosk mode.
+
+1. Auto login
 
 ``` bash
 mkdir -p /etc/systemd/system/getty@tty1.service.d
@@ -42,6 +42,8 @@ ExecStart=-/sbin/agetty --autologin xxx --noclear %I $TERM
 sudo systemctl daemon-reload
 ```
 
+2. Setup user to startx
+
 ``` bash
 # /home/xxx/.bash_profile
 if [ -z "$DISPLAY" ] && [ "$(tty)" = "/dev/tty1" ]; then
@@ -49,6 +51,8 @@ if [ -z "$DISPLAY" ] && [ "$(tty)" = "/dev/tty1" ]; then
 fi
 ```
 
+3. Setup scripts
+
 ``` bash
 # /home/xxx/.xinitrc
                              
@@ -57,7 +61,6 @@ export SSL_CERT_DIR=/etc/ssl/certs
 export SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
 
 matchbox-window-manager &
-
 chromium \
   --kiosk \
   --noerrdialogs \
@@ -68,3 +71,31 @@ chromium \
 ``` bash
 chmod +x /home/xxx/.xinitrc
 ```
+
+## misc
+
+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
+```