Sony Vaio Chipset Driver For Mac
You can probably find out what it is with the device IDs. In Device Manager, open the preferences of you Unknown Device and go to the 'Details' tab.
Chipset Driver Wikipedia
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Sony Vaio VPCZ21AGX/B Intel Chipset Driver for Windows 7 x64 Publisher's Description. Support by Sony mobile app: stay informed about news, software/firmware updates and more! 1st Dec 2017 - VAIO Driver and Software Downloads Ending.
In the dropdown menu, choose 'Device Instance ID'. This will show at least one string like this: HDAUDIO FUNC01&VEN 11D4&DEV 1984&SUBSYS10280211&REV1004 It might not be complete (because the device is unknown, the Device Class (like 'HDAUDIO' in my example), but you'll at least have the string after VEN and the one after DEV. Write those down.
The first is the Vendor ID and the second is Device ID (it's not vendor-specific to my knowledge, so you can use it on its own). Now go to a site like and search for the Device ID in the appropriate field. That sould return the device name. If there's more on the list, do a second search with the vendor ID. With that, you should be able to look for the proper drivers.