Laptop (ThinkPad T570) headphones have sound, and there is no sound from the outside

1. Laptop (ThinkPad T570) The headphones have sound, but there is no sound from the outside. There is sound before confirmation.

2. Open the Lenovo service website: https://newsupport.lenovo.com.cn/ . Search: T570, selection: ThinkPad T570. as shown in Figure 1

3. In the newly opened page, click: Driver Download. as shown in Figure 2

4. Expand the sound card, display: Realtek sound card driver (Windows 10 64-bit 1607 and later versions), download and install. File name: audio-n1va114w.exe. as shown in Figure 3

5. Expand the hotkey, display: hotkey hotkey driver (Windows 10 64-bit), download and install. File name: sihotkey-r0yvu35w.exe. as shown in Figure 4

6. After restarting the computer, there is sound in the headphones, and there is sound on the outside.