The Logitech MX Master 4S is more than just a peripheral; it is a sophisticated AI-native device. However, as of March 2026, many users on Windows 11 (Build 25H2) are experiencing a frustrating issue: the dedicated AI Discovery Button and Smart Actions simply stop responding.
This is rarely a hardware failure. Instead, it is typically a conflict between the Logi Bolt HID Filter drivers and the new Windows AI NPU scheduling. In this guide, we will walk you through the professional driver calibration and software fixes to restore your AI workflow.
🛠️ Technical Insight: The Role of the Driver
For the AI Smart Actions to function, your PC must recognize the MX Master 4S through three distinct driver layers:
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HID-compliant Mouse: Basic cursor movement.
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Logitech Bolt HID Filter: Enables the specialized data stream for custom buttons.
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Logi Virtual Bus Enumerator: The bridge that connects your physical button press to the AI API (ChatGPT/Gemini).
If any of these layers are outdated or hijacked by generic Windows drivers, your AI features will remain “dead.”
🚀 Step-by-Step Fixes for MX Master 4S
1. Manual Driver Reinstallation (The “Clean Slate” Method)
If you see a yellow triangle in Device Manager or the AI button is unresponsive:
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Right-click the Start button and select Device Manager.
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Expand Mice and other pointing devices.
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Right-click HID-compliant mouse (the one corresponding to your MX 4S) and select Uninstall device.
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Unplug your Logi Bolt receiver.
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Download the latest Logi Options+ Driver Package (v1.98.x) and install it before plugging the receiver back in. This forces Windows to use the proprietary filter driver instead of the generic one.
2. Resolving NPU Resource Conflicts in Windows 11 25H2
Windows 11 now tries to reserve the Neural Processing Unit for its own “AI Explorer.”
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Open Settings > System > Performance.
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Locate NPU Scheduling / AI Hardware Acceleration.
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Click Add an app and navigate to
C:\Program Files\LogiOptionsPlus\logi_ai_daemon.exe. -
Set it to “High Performance.” This ensures the driver has the priority needed to trigger the AI overlay without lag.
3. Resetting the AI API Handshake
If the overlay opens but shows a “Connection Error”:
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Open Logi Options+ and go to AI Discovery > Settings.
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Sign out of your AI provider (ChatGPT or Gemini).
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Clear your default browser’s cache (Logi uses an embedded browser instance for OAuth).
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Sign back in to refresh the API token.
đź“Š Driver Compatibility & Connection Matrix
To ensure the best performance for AI Smart Actions, use this table to verify your setup:
đź’¬ Share Your Experience
Are you still getting a “Service Unavailable” error? Let us know in the comments:
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What is your motherboard/laptop model (to check NPU compatibility)?
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Are you using the Bolt Receiver or Bluetooth?
Our community of experts will help you troubleshoot the latest driver conflicts!
Read more: How to Fix Missing Intel NPU Drivers and “Intel AI Boost” Errors in Windows 11
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People Also Ask (FAQ)
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Why is my Logitech AI Discovery button not doing anything?
This is often caused by Windows 11 hijacking the AI key. Go to Windows Privacy Settings and ensure that “Third-party hardware overrides” are permitted. Also, check if the
logi_ai_daemon.exeis running in Task Manager. -
Does the MX Master 4S work with Gemini Pro 1.5?
Yes. As of the latest March 2026 driver update, Logitech added native support for Gemini Pro. You can switch models in the Smart Actions menu under “AI Provider.”
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How do I fix “AI Prompt Builder Not Loading”?
This is typically a WebGL or Driver conflict. Ensure your GPU drivers are updated, as the AI overlay uses hardware acceleration to render the prompt window.
