Sony’s official driver portal is no longer active, but archives exist:
To find the right drivers, you need to know what’s under the hood of the PCG-31311L: sony pcg31311l drivers
| Component | Driver Name/Function | | :--- | :--- | | | Intel Chipset Drivers | | Storage | Intel Matrix Storage Manager / SATA Driver | | Graphics | Intel HD Graphics / NVIDIA Graphics Driver | | Audio | Realtek High Definition Audio Driver | | Network (LAN) | Realtek PCIe GBE Family Controller Driver | | Network (WLAN) | Intel / Atheros Wireless LAN Driver | | Bluetooth | Intel / Broadcom Bluetooth Driver | | Card Reader | Realtek PCIE CardReader Driver | | Webcam | Chicony / Sony Webcam Driver | | Function Keys | Sony Shared Library / Sony Notebook Utilities / Sony Firmware Extension Parser (SFEP) | Sony’s official driver portal is no longer active,