I have downgraded and installed Windows 7 on a laptop which was bought with Win 8 pre installed.
In device manager, there are 2 unknown devices with the following identification:
- ACPI\GPIO0001 for one and,
- ACPI\SMB0002 for the second one.
The laptop is working fine, but I can't find the driver for these items. Look everywhere, including Sony website. I even bought Driver Finder to locate the drivers. But DriverFinder did not detect these devices and did not look for drivers.