I just solved my problem of unknown device in esprimo u9200. yup is true, you need the acpi driver. You can go to fujitsu support& donwload webside.
Here is the link,http://support.fujitsu-siemens.com/com/ ... loads.html
you should select accordingly to your laptop version. For U9200, the acpi bios driver for win XP (win vista dont have) are as:
ACPI BIOS Linkage Driver, Version: 220.127.116.11, Date: 10.08.2007 Size: 1,56 MB.
That is a question here, the U9200 claim that is integrated mic with the laptop. But i cant found any mic. SO SAD!!!..