# KVM Switch: Mac ↔ Nobara

Simple monitor switching via DDC/CI. Peripherals switched manually via Easy-Switch button.

## Hardware

- **Monitor:** Dell U3821DW (USB-C to Mac, HDMI 2 to Nobara)
- **Keyboard:** Logitech MX Keys S
- **Mouse:** Logitech MX Master 4
- **Bolt #1:** Connected to Nobara (Channel 2)
- **Bolt #2:** Connected to Mac via monitor USB hub (Channel 3)

## Channel Setup

| Channel | Connection | Computer |
|---------|------------|----------|
| 2 | Bolt #1 | Nobara |
| 3 | Bolt #2 | Mac |

## Mac Setup

### Install m1ddc
```bash
brew install m1ddc
```

### Copy script
```bash
mkdir -p ~/scripts
cp to_nobara.sh ~/scripts/
chmod +x ~/scripts/to_nobara.sh
```

### Usage
```bash
~/scripts/to_nobara.sh
# Then press Easy-Switch on keyboard/mouse to Channel 2
```

## Nobara Setup

### Install ddcutil
```bash
sudo dnf install ddcutil
sudo usermod -aG i2c $USER
# Reboot required
```

### Copy script
```bash
mkdir -p ~/scripts
cp to_mac.sh ~/scripts/
chmod +x ~/scripts/to_mac.sh
```

### Set keyboard shortcut (GNOME)
```bash
# Add custom shortcut for Ctrl+Shift+Up
gsettings set org.gnome.settings-daemon.plugins.media-keys custom-keybindings "['/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/kvm/']"
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/kvm/ name 'KVM to Mac'
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/kvm/ command '/home/$USER/scripts/to_mac.sh'
gsettings set org.gnome.settings-daemon.plugins.media-keys.custom-keybinding:/org/gnome/settings-daemon/plugins/media-keys/custom-keybindings/kvm/ binding '<Shift><Control>Up'
```

### Usage
```bash
~/scripts/to_mac.sh
# Then press Easy-Switch on keyboard/mouse to Channel 3
```

## DDC Input Codes (Dell U3821DW)

| Input | Code |
|-------|------|
| HDMI 2 | 18 |
| USB-C | 27 |

## Troubleshooting

### Monitor doesn't switch
- Enable DDC/CI: Monitor Menu → Others → DDC/CI → On
- Linux: Ensure user in i2c group, reboot after adding