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If Kingdom Come: Deliverance II keeps crashing on your Steam Deck, there is no confirmed universal fix in the available evidence. Start with reversible checks—update SteamOS, restart, and rule out third-party apps—then test compatibility and graphics settings one at a time. These are general Steam troubleshooting steps, not verified KCD II-specific crash fixes.
Try these Steam Deck troubleshooting steps
Change one thing at a time and see whether the crash recurs. This makes it easier to identify whether a change helped rather than treating any step as a guaranteed fix. Steam’s general troubleshooting guidance supports the following sequence:
- Update SteamOS and restart. Install any available SteamOS updates, then restart the Deck. Steam recommends updates and a restart as early steps for instability. Steam Deck software and troubleshooting guide.
- Rule out third-party applications. Exit or disable apps installed through Desktop Mode, restart the Deck, and test the game again. If stability changes, re-enable apps individually to isolate a possible conflict. Steam’s troubleshooting guide.
- Test Proton compatibility. In your Steam Library, open Kingdom Come: Deliverance II, select the gear icon or Properties, open Compatibility, enable the option to force a compatibility tool, and try the latest Proton version available. This is a general Steam suggestion, not a confirmed KCD II crash remedy. Steam notes that choosing Proton may cause Steam to download the Windows version if only a Linux version is installed. Steam’s Steam-app troubleshooting guidance.
- Reduce graphics load. Try a lower graphics preset or reduce individual settings, then check whether the crash still happens. Steam recommends this as a general troubleshooting experiment; it does not establish that graphics settings cause every KCD II crash. Steam’s Steam-app troubleshooting guidance.
If the problem continues, Steam suggests checking whether changes in the Steam Deck Beta address the issue, consulting Steam Deck discussions, or contacting Steam Support. Before seeking help, note the game build, SteamOS channel and version, Proton choice, whether the crash occurs at launch or during play, and any error text. Steam Deck troubleshooting and support.
Is there a confirmed KCD II update or Proton fix?
The cited updates do not establish a Steam Deck crash fix. Steam Deck HQ reported on June 25, 2026 that the June 24 Proton Experimental update included “Improved controller support on desktops in Kingdom Come: Deliverance II.” That changelog item concerns controller support on desktop systems; it does not say Steam Deck crashes were fixed. Steam Deck HQ’s report on the June 24, 2026 update.
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#1 Best Overall
- 1TB NVMe SSD
- 1280 x 800 HDR OLED display with premium anti-glare etched glass, 7.4" Diagonal display size up to 90Hz refresh rate
- Wi-Fi 6E
- 50Whr battery; 3-12 hours of gameplay (content-dependent)
- Carrying case with removable liner
Deep Silver’s Hotfix 1.3.2 notes cover quest, visual stability, AI, items, and save/load changes. They mention an occasional long load from a save but do not identify a Steam Deck crash fix. Deep Silver’s Hotfix 1.3.2 notes.
Check the game’s current Steam Deck compatibility details
Valve uses four compatibility states: Verified, Playable, Unsupported, and Unknown. Playable may require configuration by the player; Unknown means Valve has not checked the game. Valve says its compatibility review is ongoing, so check the live details on the game’s Steam Library or Store page rather than relying on an older rating. A compatibility label is a general signal, not a promise that every setup will be crash-free. Valve’s Steam Deck Verified page.
Rank #2
- International (UK) Version
- 7.4” diagonal, HDR OLED, 1280 x 800 x RGB, up to 90Hz Refresh rate, High performance touch, <0.1 ms Response time, 1,000 nits peak brightness (HDR), 600 nits (SDR)
- SteamOS 3.0 (Arch-based)
- 512GB NVMe SSD, 16GB LPDDR5 on-board RAM (5500 MT/s quad 32-bit channels), microSD UHS-I supports SD, SDXC and SDHC
- 6 nm AMD APU, CPU: Zen 2 4c/8t, 2.4-3.5GHz (up to 448 GFlops FP32
Valve’s criteria cover input, display, seamlessness, and system support. For games that run through Proton, the game and its middleware should be supported by Proton under those criteria. Valve’s Steam Deck compatibility criteria.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep PC requirements in perspective
Steam lists Kingdom Come: Deliverance II as released on February 4, 2025, developed by Warhorse Studios and published by Deep Silver. Its minimum Windows PC requirements include 16 GB of RAM and 100 GB of available SSD storage. Those are PC listing requirements, not a diagnosis of why the game crashes on a Steam Deck. KCD II on Steam.
Quick Recap
Rank #4
- Valve is entering the gaming console marketplace with the new Steam Deck, a console geared towards PC gamers. The Steam Deck can be docked to a monitor, and used as a PC, or docked to a TV.
- Players can play a huge variety of games at any time with the comfort of a console and the freedom of a PC. Not anti-glare screen.
- Like the name suggests, the Steam Deck will include upgraded 1TB storage, and will include a carrying case. A micro SD slot will also enable expanded storage.
- Valve partnered with AMD to create a specialized APU optimized for handheld gaming, and Valve says the chip will deliver performance to run AAA gaming titles.
- The Steam Deck is outfitted with a 7-inch touchscreen, and two trackpads under the control sticks that allow gamers to operate games never designed outside of mouse and keyboard capabilities.
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