| Problem | Likely Fix | |---------|-------------| | No brightness control | Install Intel Graphics driver, then Sony Firmware Extension Parser | | No sound after Windows update | Reinstall Realtek HD Audio driver, disable "audio enhancements" | | Touchpad not working | Install Synaptics driver, enable via Fn+F1 or check BIOS | | Wi-Fi drops | Update wireless driver, disable "Allow computer to turn off this device" in Power Management | | Blue screen on sleep | Update Intel RST and graphics drivers |

If Sony’s portal lacks the updated file for your OS, download them directly from the hardware developers:

If you upgraded to , Sony may not offer dedicated Windows 10 drivers for this legacy machine. In this case, select Windows 7 (64-bit) ; most of these drivers can be installed using Windows Compatibility Mode. Step 3: Download Essential Drivers

Activates the internal Wi-Fi card. (Check Device Manager to see which brand your variant uses).

Sony has removed all drivers for Windows 7 and older devices from its official support websites. This means that downloading drivers directly from Sony for the PCG-31311L is now impossible. The company's support focus has shifted to newer products, and legacy drivers have been taken offline. If you attempt to search for "PCG-31311L" on Sony's eSupport pages, you will find manuals and hardware specifications, but no driver downloads for operating systems like Windows 7 or Windows 10.