Acpi\ven_hpq&dev_0004 _top_ Jun 2026

This is a comprehensive guide to identifying, troubleshooting, and fixing the unknown device often listed in Windows Device Manager as ACPI\VEN_HPQ&DEV_0004 . Executive Summary

Device Name: HP Quick Launch Buttons (or HP Wireless Assistant). Hardware ID: ACPI\VEN_HPQ&DEV_0004 (often appears as ACPI\HPQ0004 ). Function: This device controls the special function keys on HP laptops (volume up/down, brightness, wireless on/off) and manages the LED indicators on the keyboard (like the Wi-Fi light). Primary Fix: Install the HP Quick Launch Buttons driver.

1. Introduction: What is ACPI\VEN_HPQ&DEV_0004? If you have recently reinstalled Windows or performed a major update on an HP laptop, you may see an "Unknown Device" in your Device Manager. When you inspect its properties, the Hardware IDs list contains ACPI\VEN_HPQ&DEV_0004 . The Breakdown:

ACPI: Advanced Configuration and Power Interface. This indicates the device is related to power management and system board configuration. VEN_HPQ: The vendor ID "HPQ" belongs to Hewlett-Packard . DEV_0004: Device ID 0004 refers to the Quick Launch Button controller. acpi\ven_hpq&dev_0004

What does it actually do? On HP laptops (especially older models like Pavilion, Presario, and some ProBooks), the buttons above the keyboard (touch-sensitive media keys) and the function keys (Fn + F keys) require a specific interface to communicate with Windows. This driver bridges the gap between the physical hardware buttons and the Windows operating system. Without it, your special keys (Mute, Volume, Brightness) will not work, or the LED lights on them may remain stuck in the wrong state (e.g., the Wi-Fi light stays orange even if Wi-Fi is on).

2. How to Confirm the Issue Before attempting fixes, confirm this is the exact device causing the problem.

Right-click the Start button and select Device Manager . Look for a category named Other devices . Expand it. You should see Unknown device (with a yellow exclamation mark). Right-click the Unknown device and select Properties . Go to the Details tab. Under the "Property" dropdown, select Hardware Ids . If you see ACPI\VEN_HPQ&DEV_0004 or ACPI\HPQ0004 in the list, this guide applies to you. Function: This device controls the special function keys

3. The Solutions There are three main methods to resolve this, ordered from the most effective to the most manual. Method A: Automatic Installation via HP Support Assistant (Recommended) This is the easiest method for most users.

Download and install the HP Support Assistant from the official HP website. Run the software and let it scan your system. It should automatically detect the missing "Quick Launch Buttons" driver. Click Install and follow the prompts. Restart your computer.

Method B: Manual Driver Download If you prefer not to install extra software or if the Assistant failed, you can find the driver manually. The challenge is that HP sometimes hides this driver under obscure names. Introduction: What is ACPI\VEN_HPQ&DEV_0004

Go to the HP Customer Support - Software and Driver Downloads page. Enter your laptop model number or let the site detect it automatically. If given a choice, select your specific Operating System (e.g., Windows 10 64-bit). Look for a driver category named Keyboard, Mouse and Input Devices (or sometimes Driver-Keyboard, Mouse and Input Devices ). Look for a driver named HP Quick Launch Buttons .

Note: On some newer HP pages for older laptops, this may be missing. If so, you may need to select a different OS version (e.g., if you are on Windows 10, try looking under the Windows 7 or Windows 8 drivers list, as they often work).

This is a comprehensive guide to identifying, troubleshooting, and fixing the unknown device often listed in Windows Device Manager as ACPI\VEN_HPQ&DEV_0004 . Executive Summary

Device Name: HP Quick Launch Buttons (or HP Wireless Assistant). Hardware ID: ACPI\VEN_HPQ&DEV_0004 (often appears as ACPI\HPQ0004 ). Function: This device controls the special function keys on HP laptops (volume up/down, brightness, wireless on/off) and manages the LED indicators on the keyboard (like the Wi-Fi light). Primary Fix: Install the HP Quick Launch Buttons driver.

1. Introduction: What is ACPI\VEN_HPQ&DEV_0004? If you have recently reinstalled Windows or performed a major update on an HP laptop, you may see an "Unknown Device" in your Device Manager. When you inspect its properties, the Hardware IDs list contains ACPI\VEN_HPQ&DEV_0004 . The Breakdown:

ACPI: Advanced Configuration and Power Interface. This indicates the device is related to power management and system board configuration. VEN_HPQ: The vendor ID "HPQ" belongs to Hewlett-Packard . DEV_0004: Device ID 0004 refers to the Quick Launch Button controller.

What does it actually do? On HP laptops (especially older models like Pavilion, Presario, and some ProBooks), the buttons above the keyboard (touch-sensitive media keys) and the function keys (Fn + F keys) require a specific interface to communicate with Windows. This driver bridges the gap between the physical hardware buttons and the Windows operating system. Without it, your special keys (Mute, Volume, Brightness) will not work, or the LED lights on them may remain stuck in the wrong state (e.g., the Wi-Fi light stays orange even if Wi-Fi is on).

2. How to Confirm the Issue Before attempting fixes, confirm this is the exact device causing the problem.

Right-click the Start button and select Device Manager . Look for a category named Other devices . Expand it. You should see Unknown device (with a yellow exclamation mark). Right-click the Unknown device and select Properties . Go to the Details tab. Under the "Property" dropdown, select Hardware Ids . If you see ACPI\VEN_HPQ&DEV_0004 or ACPI\HPQ0004 in the list, this guide applies to you.

3. The Solutions There are three main methods to resolve this, ordered from the most effective to the most manual. Method A: Automatic Installation via HP Support Assistant (Recommended) This is the easiest method for most users.

Download and install the HP Support Assistant from the official HP website. Run the software and let it scan your system. It should automatically detect the missing "Quick Launch Buttons" driver. Click Install and follow the prompts. Restart your computer.

Method B: Manual Driver Download If you prefer not to install extra software or if the Assistant failed, you can find the driver manually. The challenge is that HP sometimes hides this driver under obscure names.

Go to the HP Customer Support - Software and Driver Downloads page. Enter your laptop model number or let the site detect it automatically. If given a choice, select your specific Operating System (e.g., Windows 10 64-bit). Look for a driver category named Keyboard, Mouse and Input Devices (or sometimes Driver-Keyboard, Mouse and Input Devices ). Look for a driver named HP Quick Launch Buttons .

Note: On some newer HP pages for older laptops, this may be missing. If so, you may need to select a different OS version (e.g., if you are on Windows 10, try looking under the Windows 7 or Windows 8 drivers list, as they often work).