Purpose: Sound from speakers and headphone jack.
Driver version: R2.82 or newer (6.0.1.7540)
Source: Realtek official site (use the "Legacy HD Audio Codec" driver).
This is not a hardware driver, but it is essential. Without this, your "Fn" keys (Volume, Brightness, Keyboard Backlight) will not work. sony vaio pcg 71315l drivers for win7
Before downloading anything, get the hardware IDs to match drivers correctly. Purpose: Sound from speakers and headphone jack