Steam Deck Installation

Lumo Optimized works great on Steam Deck! While there’s only one modpack, it includes recommended settings for handheld gaming that you can adjust after installation.

Recommended Steam Deck Settings

After installing, adjust these settings for optimal Steam Deck performance:

Feature	Setting	Reason
Render Distance	10 chunks	Balanced performance
Simulation Distance	8 chunks	Reduced CPU load
FPS Cap	60 FPS	Battery life
Fullscreen	Enabled	Full screen usage
View Bobbing	Disabled	Handheld comfort
Shaders	Disabled	Better battery/performance
GUI Scale	3	Readable on 7” screen
Controller	Pre-configured	Works out of the box

Tip

You can still enable shaders on Steam Deck! The defaults are just optimized for battery life. See the customization section below.

Installation

Step 1: Switch to Desktop Mode

1. Hold the Power button on your Steam Deck 2. Select Switch to Desktop 3. Wait for Desktop Mode to load

Step 2: Install Prism Launcher

1. Open Discover (software center) from the taskbar 2. Search for Prism Launcher 3. Click Install 4. Wait for installation to complete

Step 3: Set Up Prism Launcher

1. Open Prism Launcher from the app menu 2. On first launch, select your language 3. Select Java 21 when prompted (or let it auto-detect) 4. Set memory allocation to 4096 MB (4 GB) 5. Complete the setup wizard

Caution

Make sure to select Java 21 or higher. Minecraft 1.21+ requires it!

Step 4: Download Lumo Optimized

1. Open a web browser (Firefox is pre-installed) 2. Go to GitHub Releases
2. Download the .mrpack file for your Minecraft version 4. Save to your Downloads folder

Tip

Choose your Minecraft version: v* for 1.21.8 (latest), mc1.21-v* for 1.21.3-1.21.7, or mc1.20-v* for 1.20.x

Step 5: Import the Modpack

1. Open Prism Launcher 2. Click Add Instance 3. Select Import from zip on the left 4. Click Browse and navigate to Downloads 5. Select the .mrpack file 6. Click OK to install 7. Wait for all mods to download

Step 6: Add to Steam (Gaming Mode)

1. Open Steam in Desktop Mode 2. Click Games → Add a Non-Steam Game 3. Click Browse and navigate to: ~/.local/share/PrismLauncher/prismlauncher 4. Select the Prism Launcher executable 5. Click Add Selected Programs

Step 7: Configure Steam Input

1. In Steam, right-click Prism Launcher 2. Select Properties → Controller 3. Choose Gamepad with Mouse Trackpad 4. This enables mouse control with the right trackpad

Now you can launch Minecraft from Gaming Mode!

Controller Layout

The Steam Deck Edition uses Controlify for native controller support:

Button	Action
Left Stick	Move
Right Stick	Look around
A	Jump
B	Sneak (toggle)
X	Inventory
Y	Drop item
LB	Cycle hotbar left
RB	Cycle hotbar right
LT	Use item / Place block
RT	Attack / Break block
L3	Sprint
R3	Toggle perspective
D-Pad	Hotbar slots 1-4
Start	Pause menu
Select	Chat

Note

You can customize controls in-game: Options → Controls → Controlify Settings

Performance Tips

Battery Life

For longer battery life:

• Keep shaders disabled (default)
• Lower render distance to 8 chunks
• Enable Steam Deck’s 40Hz mode in Quick Access menu
• Keep brightness at 50% or lower

Better Graphics

If you want to enable shaders:

1. Options → Video Settings → Shader Packs 2. Select Photon Shaders 3. Click Shader Settings 4. Choose Potato or Low preset 5. Click Apply

Caution

Shaders will significantly reduce battery life (2-3 hours vs 4-5 hours).

40Hz Mode

Steam Deck can run at 40Hz, which is smoother than 30 FPS but more battery-efficient than 60:

1. Press the Quick Access button (…) 2. Go to Performance tab 3. Set Refresh Rate to 40 4. Set Frame Limit to 40

Then in-game, change max FPS to 40 in Video Settings.

Troubleshooting

Game Won’t Launch

1. Verify Java 21 is installed in Prism Launcher settings
2. Check memory allocation is at least 4 GB
3. Try launching from Desktop Mode first

Controller Not Working

1. Ensure Controlify is enabled in Mods menu
2. Check Steam Input is set to Gamepad
3. Restart the game after changing settings

Poor Performance

1. Lower render distance to 8 chunks
2. Disable shaders if enabled
3. Check Voxy render distance settings
4. Ensure no background apps are running

Game Too Small/Large

1. Adjust GUI Scale in Video Settings
2. Recommended: GUI Scale 3 for Steam Deck

Recommended In-Game Settings for Steam Deck

After launching, adjust these settings for best performance:

Setting	Recommended Value	Location
Render Distance	10 chunks	Video Settings
Simulation Distance	8 chunks	Video Settings
Max FPS	60	Video Settings
Fullscreen	Yes	Video Settings
View Bobbing	No	Video Settings
Shaders	Disabled (or Low)	Video Settings → Shader Packs
GUI Scale	3	Video Settings
Controller	Enable Controlify	Mod Menu
Voxy Quality	Low	Mod Menu → Voxy

Recommended Accessories

For the best experience:

• microSD card - Store games on external storage
• USB-C hub - Connect mouse/keyboard for setup
• Controller stand - More comfortable for extended play