# KDE Plasma Installation Summary

## Installation Status: ✅ COMPLETE

**Date**: 2026-01-09  
**Device**: Raspberry Pi Compute Module 4 (8GB RAM)  
**Previous Desktop**: LXDE with Openbox  
**New Desktop**: KDE Plasma (X11)

---

## What Was Installed

### Core Packages
- ✅ `kde-plasma-desktop` - KDE Plasma desktop environment
- ✅ `maliit-keyboard` - On-screen keyboard for touchscreen
- ✅ Additional KDE components and dependencies

### Available Sessions
- ✅ **Plasma (X11)** - `/usr/share/xsessions/plasmax11.desktop`
- ✅ **LXDE/Openbox** - Still available for revert
- ✅ **RPD-X** - Original Raspberry Pi desktop

---

## Current System State

### Session Manager Status
- **Current Default**: `/usr/bin/startx-rpd` (LXDE - unchanged)
- **KDE Available**: `/usr/bin/startplasma-x11` (priority 40)
- **LXDE Available**: `/usr/bin/lxsession` (priority 49)

### Backup Created
- ✅ Desktop configuration backed up to: `~/desktop-backup/`
- ✅ Session manager configuration saved

---

## How to Use KDE Plasma

### First Time Setup

1. **Log out of current session**
   ```bash
   # Or simply reboot
   sudo reboot
   ```

2. **At login screen:**
   - Look for session/desktop selector (usually top-right corner)
   - Click and select **"Plasma (X11)"** or **"plasmax11"**
   - Enter credentials and log in

3. **First boot into KDE:**
   - KDE will initialize (may take 30-60 seconds first time)
   - You may see a welcome screen - you can skip it
   - Desktop will appear with KDE panel

4. **Configure for Touchscreen:**
   - System Settings > Input Devices > Virtual Keyboard
     - Enable "Show on-screen keyboard when needed"
   - System Settings > Display and Monitor
     - Set scale to 125% or 150% for better touch targets
   - System Settings > Workspace Behavior > Desktop Effects
     - Disable heavy effects for better performance

---

## Chromium Autostart

Your existing Chromium autostart configuration will work with KDE:
- ✅ File: `~/.config/autostart/chromium-kiosk.desktop`
- ✅ Script: `~/start-chromium.sh`

Chromium will start automatically when KDE desktop loads.

---

## Reverting to LXDE

### Quick Method (Recommended)
1. Log out
2. At login screen, select "Openbox" or "RPD-X" session
3. Log in

### Using Revert Script
```bash
# Copy revert-to-lxde.sh to device
scp revert-to-lxde.sh pi@10.130.60.253:~/
ssh pi@10.130.60.253 "chmod +x ~/revert-to-lxde.sh && ~/revert-to-lxde.sh"
```

### Manual Revert
```bash
sudo update-alternatives --config x-session-manager
# Select: /usr/bin/startx-rpd or /usr/bin/lxsession
```

---

## Performance Expectations

### RAM Usage
- **LXDE**: ~200-300MB
- **KDE Plasma**: ~400-800MB
- **Available**: ~6.7GB (plenty of headroom)

### CPU Usage
- **Idle**: Low (< 5%)
- **Active**: Moderate (10-30%)
- **Heavy tasks**: May see some lag on Cortex-A72

### Boot Time
- **LXDE**: ~20-30 seconds
- **KDE Plasma**: ~30-45 seconds (first boot may be longer)

---

## Troubleshooting

### KDE Won't Start
```bash
# Check if installed
dpkg -l | grep kde-plasma

# Check available sessions
ls /usr/share/xsessions/

# Try manual start (if logged in via SSH)
DISPLAY=:0 startplasma-x11
```

### Performance Issues
- Disable desktop effects: System Settings > Workspace Behavior > Desktop Effects
- Reduce animations: System Settings > Workspace Behavior > General Behavior
- Use X11 (already configured) instead of Wayland

### Touchscreen Issues
```bash
# Check touchscreen device
xinput list

# Calibrate if needed
sudo apt-get install xinput-calibrator
xinput_calibrator
```

### Chromium Not Starting
- Check autostart file: `cat ~/.config/autostart/chromium-kiosk.desktop`
- Check script: `cat ~/start-chromium.sh`
- Manual test: `DISPLAY=:0 ~/start-chromium.sh`

---

## Files and Locations

### Configuration Files
- KDE config: `~/.config/plasma*`
- KDE panel: `~/.config/plasma-org.kde.plasma.desktop-appletsrc`
- Window manager: `~/.config/kwinrc`
- Session: `/usr/share/xsessions/plasmax11.desktop`

### Backup Location
- `~/desktop-backup/` - Original LXDE configuration

### Documentation
- `KDE-INSTALLATION-GUIDE.md` - Full installation and revert guide
- `revert-to-lxde.sh` - Automated revert script
- `TOUCHSCREEN-DESKTOP-OPTIONS.md` - Desktop environment comparison

---

## Next Steps

1. ✅ **Reboot the device**
   ```bash
   ssh pi@10.130.60.253 "sudo reboot"
   ```

2. ✅ **Select KDE at login**
   - Choose "Plasma (X11)" from session selector

3. ✅ **Configure touchscreen settings**
   - Enable on-screen keyboard
   - Adjust UI scaling
   - Disable heavy effects

4. ✅ **Test Chromium autostart**
   - Verify Chromium starts in fullscreen
   - Check if it properly fills the screen

---

## Support

If you encounter issues:
1. Check logs: `journalctl -xe`
2. Check X session: `~/.xsession-errors`
3. Verify packages: `dpkg -l | grep kde`
4. Review documentation: `KDE-INSTALLATION-GUIDE.md`

---

## Notes

- KDE Plasma is installed but **not set as default** - you choose at login
- LXDE is still available and can be selected at any time
- All original configurations are backed up
- Chromium autostart will work with both desktops
- Performance should be acceptable on Pi 4 with 8GB RAM