Subnautica 2 Crash on Startup with AMD Adrenalin 26.5.1

What causes Subnautica 2 to crash with AMD Adrenalin 26.5.1?

Subnautica 2 entered Steam Early Access on May 9, 2026. Within days, Radeon owners on AMD's Adrenalin 26.5.1 WHQL driver branch reported that the game crashes back to desktop within 2-15 seconds of pressing Play — usually before the menu finishes rendering, with no error dialog. The problem is reproducible specifically on Radeon RX 9000 series (9070, 9070 XT, 9080) and a subset of RX 7000 series cards, and traces to a regression in Adrenalin 26.5.1's Vulkan shader compiler that mis-handles Subnautica 2's bindless texture descriptor layout.

AMD Adrenalin 26.5.1 was released May 7, 2026 as a "game-ready" driver for the Forza Horizon 6 launch. The previous stable branch, Adrenalin 26.3.1, does not exhibit the crash and is the cleanest current workaround until AMD ships a 26.5.x hotfix.

When does it occur?

• Immediately after clicking Play on Steam (within 2-15 seconds)
• During the Unknown Worlds intro splash, often a frozen single frame followed by crash
• When the game tries to compile its first Vulkan shader pipeline
• After a Windows update or AMD driver auto-update bumped you to 26.5.1
• After AMD Software / Adrenalin pushed a "recommended" driver overnight
• Sometimes mid-session when entering a biome with new shader effects (less common)

Common causes

• AMD Adrenalin 26.5.1 Vulkan compiler regression — Confirmed in the Subnautica 2 Discord bug-report channel and AMD community forums; affects bindless descriptor layout
• Radeon RX 9000 series RDNA 4 driver immaturity — The 9070 / 9070 XT have had multiple Vulkan stability issues since launch and are most affected
• Game defaults to Vulkan — Subnautica 2 uses Unity 2023.x with Vulkan as the default backend on AMD; the buggy path is mandatory unless overridden
• Auto-installed driver from AMD Software — The Adrenalin app prompts users to update on launch; many were silently moved to 26.5.1
• Conflicting AMD overlay (Radeon Image Sharpening / Radeon Boost) — Driver-level overlays interact with the Vulkan swap chain and worsen the crash
• Cached shader pre-compile from prior driver — Shader cache built on 26.5.1 stays poisoned even after rollback unless cleared

Step-by-step fixes

1. Confirm you are on 26.5.1 — Open AMD Software: Adrenalin Edition > top-right gear icon > System tab. Driver version reads "Adrenalin Edition 26.5.1" or "Driver Version 26.20.51". If yes, this guide applies.

1. Roll back to Adrenalin 26.3.1 (recommended fix) — Download the Adrenalin 26.3.1 WHQL package from [amd.com/support](https://amd.com/support) > select your card > Drivers & Support > Previous Drivers. Run AMD Cleanup Utility first (also on amd.com) in Safe Mode, then install 26.3.1 with the "Factory Reset" option checked. Reboot. Subnautica 2 will launch cleanly.

1. Block the bad driver from re-installing — In AMD Software, click gear > Preferences > set Update preference to "Manual" and disable "Automatically check for updates." This stops Adrenalin from silently bumping you back to 26.5.1.

1. Force the DirectX 12 backend as a temporary workaround — If you must stay on 26.5.1, right-click Subnautica 2 in Steam > Properties > General > Launch Options > paste -force-d3d12. The DX12 backend bypasses the Vulkan compiler regression at a small performance cost. Save and relaunch.

1. Clear the Subnautica 2 shader cache — Navigate to %LOCALAPPDATA%\Unknown Worlds\Subnautica 2 and delete any folder named ShaderCache, VulkanShaderCache, or DXShaderCache. Also clear %LOCALAPPDATA%\AMD\GLCache and %LOCALAPPDATA%\AMD\DxcCache. Restart the PC before relaunching.

1. Disable AMD overlay features — In AMD Software > Gaming tab > Subnautica 2 profile > turn off Radeon Image Sharpening, Radeon Boost, Radeon Anti-Lag, and Radeon Chill. These layer themselves into the Vulkan pipeline and amplify the bug on RX 9000.

1. Verify game integrity — In Steam, right-click Subnautica 2 > Properties > Installed Files > Verify integrity of game files. Removes corruption that compounds the crash, particularly if you are seeing intermittent crashes rather than 100% reproduction.

1. Run as administrator and disable Windows fullscreen optimizations — Right-click Subnautica2.exe in the install folder > Properties > Compatibility > check Run as administrator and Disable fullscreen optimizations. Apply, then launch from Steam normally.

If it still doesn't work

If rolling back to 26.3.1 still produces a crash, the issue may not be Adrenalin 26.5.1 specifically — it could be a separate Vulkan issue on your card. Run DDU (Display Driver Uninstaller from guru3d.com) in Safe Mode with the AMD GPU + Audio options, fully wipe the driver stack, then install 26.3.1 fresh from a downloaded .exe rather than from AMD Software's installer.

Track AMD's status at [amd.com/en/resources/support-articles/release-notes](https://amd.com/en/resources/support-articles/release-notes) — when Adrenalin 26.6.x ships, the Subnautica 2 fix should be in the release notes ("Resolved Issues"). Watch the [Subnautica 2 Steam Community](https://steamcommunity.com/app/1962700/discussions/) Bugs & Performance forum and the official Unknown Worlds Discord for hotfix confirmation. If you suspect a hardware issue rather than driver, stress-test the GPU with vkcube (from the LunarG Vulkan SDK) — clean execution of vkcube proves the Vulkan runtime is healthy and isolates the bug to Subnautica 2 + Adrenalin 26.5.1.