This shows up as an "Unknown Device" in the Device Manager if missing. It is proprietary to Sony hardware.
Finding the correct drivers for legacy laptops can be challenging, especially since Sony officially exited the personal computer business in 2014 and transferred its VAIO brand. The Sony Vaio PCG-31311X (often cross-referenced with the VPCYB15KX or VPCYB series) is a compact, AMD-powered netbook that originally shipped with Windows 7.
Download the offline version (approx 16GB). Run it on your Vaio. It will detect the PCG-31311X and offer matching drivers for 90% of components, including the modified NVIDIA INF. Use the "Expert" mode for Optimus. Drivers Sony Vaio Pcg 31311X Windows 7
Because the Sony Support Portal removed vintage downloads, use these reliable alternative methods to source setup packages: Drivers and Software updates for Laptop PC | Sony USA
Restores short-range wireless pairing. Audio and Input Drivers This shows up as an "Unknown Device" in
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
Sony Corporation sold its VAIO PC business in 2014. The original support websites (e.g., esupport.sony.com or vaio-link.com) have been either redirected, shut down, or left with broken links. If you type "Sony Vaio PCG-31311X drivers" into the official portal, you will likely get a 404 error. The Sony Vaio PCG-31311X (often cross-referenced with the
Restores sound functionality to the internal speakers and headphone jack.
This method bypasses the model name altogether and searches for drivers based on the unique hardware ID of each component. It is often the most direct way to find a driver for a specific, problematic piece of hardware.
Once you have downloaded the necessary driver files, a methodical installation process is essential. This ensures that all components are correctly installed and configured, minimizing the risk of errors or conflicts.
If you have no audio after installing the driver: